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Friday, November 20, 2020 | History

3 edition of Turbulent mixing in supersonic high-temperature exhaust jets found in the catalog.

Turbulent mixing in supersonic high-temperature exhaust jets

L.-Y Jiang

Turbulent mixing in supersonic high-temperature exhaust jets

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  • 20 Currently reading

Published by Institute for Aerospace Studies, University of Toronto in North York, Ont .
Written in English

    Subjects:
  • Aerodynamics, Supersonic -- Mathematics.,
  • Plumes (Fluid dynamics) -- Mathematical models.,
  • Jets -- Fluid dynamics -- Mathematics.,
  • Turbulence -- Mathematical models.,
  • Diffusion -- Mathematical models.

  • Edition Notes

    Statementby Lei-Yong Jiang and J.P. Sislian.
    SeriesUTIAS report,, no. 351
    ContributionsSislian, Jean Pascal, 1929-, University of Toronto. Institute for Aerospace Studies.
    Classifications
    LC ClassificationsTL570 .T58 no. 351, TL571 .T58 no. 351
    The Physical Object
    Paginationxxiv, 328 p. :
    Number of Pages328
    ID Numbers
    Open LibraryOL724782M
    LC Control Number97112709
    OCLC/WorldCa35975841

      An experimental investigation of the flow and acoustic properties of a moderate-Reynolds-number (Re = ), Mach number M = 21, axisymmetric jet has been measurements extended the experimental studies conducted previously in this laboratory to a higher-Reynolds-number regime where the flow and acoustic processes are considerably more by: Abstract. Various papers on high-speed flight propulsion systems are presented. The topics addressed are: propulsion systems from takeoff to high-speed flight, propulsion system performance and integration for high Mach air-breathing flight, energy analysis of high-speed flight systems, waves and thermodynamics in high Mach number propulsive ducts, turbulent free shear layer mixing and. At least four factors affect the rate of dilution of jet exhaust before it reaches receptors adjacent to taxiways or runways: (1) turbulent mixing of the jet exhaust at the engine exit; (2) buoyant plume rise; (3) advective dilution; and (4) dispersion by ambient turbulence.


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Turbulent mixing in supersonic high-temperature exhaust jets by L.-Y Jiang Download PDF EPUB FB2

The second section sets forth the theory of turbulent gas jets, including strongly preheated and supersonic jets. The theory of free turbulence in a gas, suitable in principle for any degree of compressibility, is revised, and the equations are derived for motion and heat exchange in the boundary layer of a jet at very high temperature.5/5(2).

the turbulent mixing region approaches supersonic values. At the high exhaust velocities of present today rocket en- gines, this law predicts a physically unrealistic result that over % of the jet propulsive power is converted to noise.” Experimental data suggest a u6 dependence of the sound power level for supersonic jets of low MachFile Size: 1MB.

The second section sets forth the theory of turbulent gas jets, including strongly preheated and supersonic jets. The theory of free turbulence in a gas, suitable in principle for any degree of compressibility, is revised, and the equations are derived for motion and heat exchange in the boundary layer of a jet at very high temperature.

In this study, the SST k-ω turbulent model was temperature corrected and used to predict the cold supersonic oxygen jet from the Laval nozzle injecting into the high-temperature environment. The simulation results were compared with the experimental results of SUMI et al. 5) and some empirical data under same by: 3.

This report gives a detailed description of aerodynamic (Shock-free/Shocked flow) and acoustic turbulent mixing computer prediction programs developed by the General Electric Company for subsonic and supersonic simple exhaust jets.

the growth rate of turbulent mixing layer. As a result, the velocity decreases more slowly is:(Allemand, et al., ). Abdol-Hamid et al. () proposed a temperature corrected turbulence model to take into account the large temperature fluctuation when high temperature supersonic jet exits into cold atmosphere.

But their model did not giveCited by: 2. This paper examines the generation of sound produced by high temperature supersonic jets. In particular, the question of the importance of supersonic instability waves to noise emission is considered relative to the role of Kelvin-Helmholtz (K-H) instability waves.

Mach wave emission from a high-temperature supersonic jet. John M. Seiner, The effect of heat on turbulent mixing noise in supersonic jets. Woutijn Baars, Mach wave emission from a high temperature supersonic jet. SEINER, Cited by: In general, velocity is measured within ±10 m/s accuracy and temperature within ±10°K accuracy.

With the advent of the High Speed Civil Transport program, the flow field of the supersonic free jets has generated renewed interest. The sound generated from such jets is of primary Size: 1MB.

Story time just got better with Prime Book Box, a subscription that delivers editorially hand-picked children’s books every 1, 2, or 3 months — at 40% off List by: 7. For similar upstream stagnation temperature and stagnation pressure, the local density ratio between the supersonic external mixing layer and the Turbulent mixing in supersonic high-temperature exhaust jets book air in standard conditions (1 atm and K) is typically for the air jet, while a value of around is observed in the case of hydrogen by: 9.

Study of supersonic wave Turbulent mixing in supersonic high-temperature exhaust jets book in high-speed turbulent jets using an LES database Journal of Sound and Vibration, Vol.

No. 25 Toward a Comprehensive Model of Jet Noise Using an Acoustic Analogy. The rate at which supersonic jet mixes with the surrounding ambient fluid includes turbulent mixing and compressibility effects such as isentropic expansion and shock.

Numerical simulations are performed using commercially available software FLUENT v to investigate supersonic jet flow field mixing with surrounding : S.

Sathish Kumar, C. Muthuraj. In order to develop an efficient jet mixing method, direct numerical simulations of combined jets are carried out. The Reynolds number defined with a nozzle diameter is Re=   A numerical model for the calculation of gas dynamic systems with turbulent mixing of supersonic jets is proposed.

The problem of designing a transitional flow-equalization channel of minimum length is solved for the viscous turbulent mixing of two parallel or mutually inclined supersonic flows. The problem is solved in two stages. In the first stage the flow-equalization channel Author: V.

Kireev, S. Minin, U. Pirumov, N. Smagin, S. Smirnov. Navier–Stokes analysis methods for turbulent jet flows with application to aircraft exhaust nozzles. Author links developed a k – ε correction to be coupled with a standard k – ε model in order to accurately predict the rapid turbulent mixing exhibited by DeBonis has performed LES on a supersonic jet, Machand a Cited by: Abstract A three-dimensional viscous flow analysis for complex supersonic nozzle exhaust jets has been developed.

Calibration calculations identify the applicability of algebraic turbulence models for simple jet flows and the need for a more sophisticated model for complex physical and geometrical jet. In this study, fluid mixing and chemical reactions in the near field of an engine exhaust jet plume were investigated using a mixing model that explicitly incorporates the large-scale mixing process as entrainment events and stochastically simulates small-scale turbulent mixing and Cited by: Supersonic turbulent fuel-air mixing and evaporation Researchers at the University of Queensland in Australia claimed on Aug a world first - a flight-test of supersonic combustion-an air-breathing supersonic engine, tagged as a scramjet.

An experimental jet broke a world speed record on Nov. 17,cruising at around mph (M. Computational Fluid Dynamics Simulation of Supersonic Oxygen Jet Behavior at Steelmaking Temperature.

Metallurgical and Materials Transactions B, Morshed Alam. Download with Google Download with Facebook or download with email. Computational Fluid Dynamics Simulation of Supersonic Oxygen Jet Behavior at Steelmaking Temperature. Download. supersonic combustion involves turbulent mixing, shock interaction and heat release in supersonic flow.

The flow field within the combustor of scramjet engine is very complex and that poses a considerable challenge in designing and development of a supersonic combustor with an File Size: 4MB. The book focuses on the processes and reactions involved in combustion.

The selection first offers information on flame strength of propane-oxygen flames at low pressures in turbulent flow and mixing and flow in ducted turbulent jets.

Topics include radial profile of the jetting velocity, radial growth of the jet, and mixing zones of a ducted Edition: 1. turbulent jet to ignite the lean mixture instead of a conventional. electric spark [].

The hot turbulent jet is generated by burning a the mixing process between the hot exhaust and the fresh lean mixtures, turbulence, and strain rate all Supersonic jets create a high temperature zone at the downstream of shock structures.

This regionFile Size: 3MB. of supersonic air. The air is at sufficiently high temperature and pressure for the fuel to combust and the resulting mixture is discharged from the engine at a higher pressure.

The Scramjet engine is composed of four main sections: the inlet, isolator, combustor and exhaust [2]. Figure 1: Generic Scramjet engine. The second section sets forth the theory of turbulent gas jets, including strongly preheated and supersonic jets.

The theory of free turbulence in a gas, suitable in principle for any degree of compressibility,is revised, and the equations are derived for motion and heat exchange in the boundary layer of a jet at very high : 1. Rayleigh/Mie scattering (from flow-field ice crystals) was used to study mixing and penetration of a forced supersonic jet in a supersonic Mach (M)-2 cross stream.

Instantaneous images—using image planes along (side-view) and normal (end-view) to the flow axis—were used to study the dynamical structures in the jet whereas ensemble images provide information regarding the jet Cited by: Supersonic high-temperature exhaust plumes cause rocket engine damage on the launcher and surrounding equipment.

Thermal erosion due to high temperature is one of the main factors damaging the launcher. Generally, the launcher, the diversion trench and even the missile are directly affected by jet by: 3. The most prominent component of turbulent mixing noise in jets is associated with Mach wave radiation.

Large-turbulence structures radiate Mach waves efficiently when they convect supersonic relative to the ambient. 0 = K) fully expanded Mach jet to investigate the effect of File Size: 5MB. STRUCTURE OF TURBULENT SONIC UNDEREXPANDED FREE JETS by *,M.-C.

Lai t andG. Faeth $ Department of Aerospace Engineering The University of Michigan Ann Arbor, Michigan AhlmI Turbulent mixing in adapted and weakly underexpanded (underexpansion ratios less than ) round jets, involving.

The radiation of sound from a perfectly expanded Mach cold supersonic jet of mm exit diameter flowing through a partially open rigid-walled duct with an upstream J Cited by: 5. The characteristics, both spectral and directivity, of the sound field of supersonic shock-free jets are studied by measuring the turbulent mixing noise in the far field from four two-inch diameter nozzles, namely a convergent nozzle for pressure ratios up to critical and three convergent- divergent nozzles having nominal design Mach numbers of, andby: The characteristics, both spectral and directivity, of the sound field of supersonic shock-free jets are studied by measuring the turbulent mixing noise in the far field from four two-inch diameter nozzles, namely a convergent nozzle for pressure ratios up to critical and three convergent- divergent nozzles having nominal design Mach numbers of, andrespectively.

The high temperature and high pressure supersonic jet is one of the key problems in the design of solid rocket motors. To reduce the jet temperature and noise, cooling water is typically injected into the exhaust plume.

Numerical simulations for the gas-liquid multiphase flow field with mixture multiphase model were developed and a series of experiments were carried by: 3. For the Love of Physics - Walter Lewin - - Duration: Lectures by Walter Lewin. They will make you ♥ Physics. Recommended for you.

The numerical investigation is based on flow equations governing turbulent, compressible, two-dimensional, steady, time averaged, and boundary layer equations.

These equations are iteratively solved using finite-difference method under the conditions of different flow regimes, which can be divided into several distinctive regions where the Cited by: 8.

The Eggers3 jet refers to a experiment characterizing supersonic turbulent jets. A Mach isothermal jet with nozzle exit diameter of ” ( m) was exhausted into ambient air, with a pressure ratio of The experiment supplies velocity profiles in the near- and far-field of the jet. This experiment provides a standard test caseCited by: 6.

Irannejad, A. et a. "Large Eddy Simulation of Supersonic Turbulent Combustion with FMDF", 52nd AIAA Aerospace Sciences Meeting, AIAA Two manners of becoming three-dimensional for mixing layers.- The simulation of turbulent separated boundary layers and wall jets.- Mixing of transverse jets and wall jets in supersonic flow.- Poster session.- Numerical simulation of supersonic free jet by TVD schemes.- Interaction of plane, turbulent jets.- Parametric analysis of acoustic near.

Get this from a library. The theory of turbulent jets. [G N Abramovich; Leon Schindel] -- "The author's first monograph on turbulent jets, indealt solely with a free submerged jet. Since that time, the theory of the turbulent jet has been developed in many published works both in.

Page - Experiments on the Instability Waves in a Supersonic Jet and Their Acoustic Radiation, ‎ Appears in 18 books from Page - Crow, SC; and Champagne, FH: Orderly Structure in Jet. If the exhaust gas pressure is not sufficiently high enough to drive the flow to sonic at the throat, then there is no way you can have a supersonic flow.

Since the exhaust gases take time to cool, you can not just instantly change the relative gas conditions and use the ambient sonic speed to define it's Mach number.ROCKET EXHAUST PLUMES The ambient air mixes with the hot exhaust gases and secondary combustion or afterburning occurs in the mixing layer.

It is a turbulent layer surrounding the core and its thickness increases with distance from the nozzle as well as with Size: KB.turbulent spectra and convection velocity as a function of frequency were not presented.

Kerherve´ et al performed two-point space–time correlations within a supersonic Mach cold jet. Thus, while this study was very thorough, the pursuit of spatio-temporal characteristics for a heated supersonic exhaust jet still continues.