scholarly journals Calculation of the interaction of a supersonic jet with a flat obstacle inclined off the jet axis

2020 ◽  
Vol 2020 (4) ◽  
pp. 72-81
Author(s):  
V.P. Halynskyi ◽  
Keyword(s):  
Flow Field ◽  
Pressure Distribution ◽  
Cross Section ◽  
Inclination Angle ◽  
Supersonic Jet ◽  
Jet Flow ◽  
Plate Surface ◽  
Front Edge ◽  
Flow Parameters ◽  
Jet Axis

This paper presents results of a numerical solution of the model problem of the interaction of a plane supersonic jet with a semiinfinite flat plate inclinable off the jet axis. The paper is devoted to the study of the flow parameters in the jet flow field and the pressure distribution over the plate surface as a function of the plate inclination. The aim of the paper is to obtain the flow parameters in the jet flow field and the pressure distribution over the plate surface as a function of the plate inclination angle and front edge position. To obtain numerical results, marching algorithms in the inviscid gas and viscous layer approximation were used. At specified values of the supersonic underexpanded/overexpanded jet parameters, calculations were conducted in the plate inclination angle range of 0 to 20?. The position of the plate front edge was specified by two coordinates: a longitudinal and a transversal one, and in the parametric calculations the transversal coordinate was varied at a fixed longitudinal one. The cross-section at which the nonuniform jet field starts to interact with the plate was determined as a function of both the plate front edge position and the plate inclination. The numerical study showed the following: with increasing plate inclination angle, the oscillation frequencies of the flow parameters in the jet flow field and on the plate surface decrease, while their oscillation amplitudes increase, and the position of the maximum pressure point on the plate surface depends on the initial position of the plate front edge and may not coincide with the cross-section at which the jet–plate interaction starts. The results obtained may be used in qualitative estimation of the effect of different parameters in the jet flow field.

Numerical study of the ejection properties of a jet flowing into flooded space

2020 ◽  
Author(s):  
A.Yu. Lutsenko ◽  
V.A. Kriushin
Keyword(s):  
Pressure Distribution ◽  
Nozzle Exit ◽  
Software Package ◽  
Numerical Study ◽  
Supersonic Jet ◽  
Underlying Surface ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Underexpanded Supersonic Jet ◽  
Jet Axis

The purpose of the study was to carry out a numerical simulation of the interaction of an underexpanded supersonic jet flowing into a flooded space with a normally located obstacle, and with the underlying surface. We performed the calculations in the ANSYS Fluent software package and presented flow patterns. For the case when the obstacle is located normally to the axis of the jet, we compared the pressure distribution in the radial direction with experimental data and made a conclusion about the changes in the integral load on the wall with a change in the distance to the nozzle exit. For the case when the obstacle is parallel to the jet axis, we presented the pressure distribution along the wall in the plane of symmetry, estimated the relative net force acting on the underlying surface, analyzed the nature of its change at various values of the off-design coefficient, the Mach number on the nozzle exit and the distance to the jet axis.

Numerical Simulation of Atmospheric Flow Field around Bridge

2013 ◽  
Vol 368-370 ◽  
pp. 1379-1382
Author(s):  
Ying Jia ◽  
Li Zhang ◽  
Sheng Zhang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Pressure Distribution ◽  
Cross Section ◽  
Horizontal Plane ◽  
Atmospheric Flow ◽  
Airflow Field ◽  
Distribution Laws ◽  
The Cross

This paper carries out a numerical simulation of the atmospheric flow field around bridge. The variation law of airflow field around bridge is studied. Velocity and pressure distribution laws of flow field in horizontal plane and the cross-section are discussed, and influence range of flow field around bridge area is identified.

The Experimentation and Imitation Study on Flow Field of Coherent Jet

2010 ◽  
Vol 150-151 ◽  
pp. 930-936
Author(s):  
Kun Liu ◽  
Ren Zhi Han ◽  
Chun Yang
Keyword(s):  
Flow Field ◽  
Supersonic Jet ◽  
Jet Flow ◽  
Compressed Air ◽  
Measuring System ◽  
Low Density ◽  
Flow State ◽  
Oxygen Lance ◽  
Coherent Jet ◽  
Cold Condition

By oxygen lance measuring system, under the normal temperature (cold condition) systematic study is carried on traditional supersonic jet flow field that is simulated by compressed-air and on coherent jet flow flied which is accompanied by low density helium in this paper, By commercial software FLUENT, associated with experimental data, the standard double equation K- model is revised appropriately with C1=1.45，C2=1.88. The behavior of axis symmetric jet can be predicted better by simulated results. The flow state of traditional supersonic jet and the characteristic of coherent jet flow flied under vice-hole helium low density concomitance situation are analyzed systematically.

scholarly journals Experimental investigation of pressure fields in a single trench dimple

2021 ◽  
Vol 2119 (1) ◽  
pp. 012033
Author(s):  
N Yan Lun ◽  
I N Baranov ◽  
V I Terekhov ◽  
I A Chokhar
Keyword(s):  
Experimental Investigation ◽  
Reynolds Number ◽  
Pressure Distribution ◽  
Cross Section ◽  
Inclination Angle ◽  
Longitudinal Axis ◽  
Flat Channel ◽  
Pressure Fields

Abstract The paper describes the technique and results of an experimental investigation of the pressure distribution over the surface of an oval trench dimple (OTD). The trench dimple in cross-section is a cylindrical segment on one of the flat channel walls. The experiments were carried out at a constant Reynolds number Re D = 3.2 · 104 and variation of the inclination angle relative to the longitudinal axis of the channel in the range φ = 0 – 90°.

scholarly journals Raman temperature and density measurements in supersonic jets

2021 ◽  
Vol 62 (3) ◽  
Author(s):  
Mark P. Wernet ◽  
Nicholas J. Georgiadis ◽  
Randy J. Locke
Keyword(s):  
Flow Field ◽  
Supersonic Jet ◽  
Ambient Air ◽  
Jet Flow ◽  
Supersonic Jets ◽  
Jet Flows ◽  
Turbulent Heat ◽  
Flow Measurements ◽  
Potential Core ◽  
The Mean

AbstractPrediction of flow-field properties in supersonic jets using computational fluid dynamics (CFD) code predictions has become routine; however, obtaining accurate solutions becomes more challenging when there is a significant temperature difference between the jet core and the ambient air and/or compressibility effects are significant. Benchmark sets of flow field property data are required in order to assess current CFD capabilities and develop better modeling approaches for these turbulent flow fields where accurate calculation of temperatures and turbulent heat flux is important. Particle Image Velocimetry, spontaneous rotational Raman scattering spectroscopy, and Background-Oriented Schlieren (BOS) have been previously used to acquire measurements of the mean and root-mean-square (rms) velocities, the mean and rms gas temperatures, and density gradients in subsonic jet flows and film cooling flows. In this work, the ability to measure density is added to the list of measurands available using the acquired Raman spectra. The suite of measurement techniques are now applied to supersonic jet flows. The computation of the local gas pressure in the potential core of an over-expanded jet is demonstrated using the Raman measured gas temperature and density. Additionally, a unique density feature in temperature matched, perfectly expanded jet flow shear layers identified using BOS was verified using the Raman measurement technique. These non-intrusive flow measurements are compared against RANS predictions of the supersonic jet flow properties as a means of assessing their prediction accuracy. Graphic abstract

Numerical study of interaction between jet with rudders on slender body at hypersonic condition

2018 ◽  
Vol 32 (12n13) ◽  
pp. 1840019 ◽  
Author(s):  
Long-Fei Li ◽  
Jiang-Feng Wang ◽  
Fa-Ming Zhao ◽  
Yu-Han Wang
Keyword(s):  
Flow Field ◽  
Pressure Distribution ◽  
Free Stream ◽  
Numerical Study ◽  
Jet Flow ◽  
Numerical Results ◽  
Slender Body ◽  
Total Force ◽  
Amplification Factors ◽  
Jet Nozzle

In this paper, a numerical study of the interaction between transverse cold jets on slender body in front of or between X-shape rudders with rudders in the oncoming free stream is presented. Firstly, the flow field at different jet conditions is simulated and analyzed. Then, the total force and moment amplification factors of the corresponding slender body with jet at different locations are analyzed and compared with those results of non-jet flow. Numerical results show that interactions take a great effect to the configuration of the flow field around rudders and the pressure distribution on slender surface. Moreover, the force and moment amplification changes regularly along with the location of jet nozzle.

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