New visions in experimental investigations of a supersonic under-expanded jet into a high subsonic crossflow

Hojaji, Mohammad; Soltani, Mohammad Reza; Taeibi-Rahni, M.

doi:10.1243/09544100jaero748

Cited by 10 publications

(6 citation statements)

References 20 publications

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“…Because of its importance in science and engineering, side jet interaction with free stream is studied extensively for high altitude and high Mach number conditions [10,11] as well as for subsonic Mach numbers [12][13][14][15][16][17][18] at sea level conditions. Detailed experimental flow field analysis using PIV measurements were made by Beresh et al [12][13][14], for study of penetration of a transverse / inclined supersonic jet into a subsonic compressible crossflow.…”

Section: Introductionmentioning

confidence: 99%

Aero-Propulsive Characterization of a Flight Vehicle with Two Side-Jets

Balasubramanian,

Dayal,

Krishnamurthy

et al. 2023

joast

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Numerical simulations were carried out to study the aero-propulsive characteristics of a flight vehicle using in-house developed Reynolds Averaged Navier-Stokes code CERANS. The analyses involved subsonic external flow with inclined supersonic dual sustainer jets at various angles of attack, roll orientations and side slip. The control characteristics of the configuration are evaluated for the flow with and without sustainer jets. Numerical simulations indicated that the jet plume exhausting out of the scarf sustainer nozzle grazed and clung to the airframe for a considerable downstream distance causing serious damage to the airframe. This numerical study led to an important design change of the sustainer nozzle shape from ‘scarf’ to ‘conical’ which alleviated plume interference problem with the airframe.

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Section: Introductionmentioning

confidence: 99%

Aero-Propulsive Characterization of a Flight Vehicle with Two Side-Jets

Balasubramanian,

Dayal,

Krishnamurthy

et al. 2023

joast

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“…Jet control is one of the key techniques in aerodynamic design of advanced air vehicle. 3,4 Researchers have carried out a lot of research work on jet control. Spaid and Zukoski 5 studied the interaction between jet and different flow conditions, and studied the main parameters of jet interaction flow field.…”

Section: Introductionmentioning

confidence: 99%

Unsteady test technique of jet control with multi-parameter coupling

Xue

Cao

et al. 2022

Advances in Mechanical Engineering

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In this paper, the jet control effect of air vehicle is studied, and a new multi parameter coupling unsteady test technique is established, which can ensure that the test model is consistent with the real air vehicle, and the jet is carried out under the condition of complete freedom and no support constraints, so that the wind tunnel test can better simulate the jet control effect of real air vehicle. The new technique overcomes the shortcoming that the previous jet test can only carry out unsteady flow field or unsteady aerodynamic force research, and can ensure that in the whole process of jet flow, the interference flow field at the nozzle, the aerodynamic force of the air vehicle, especially the movement of the air vehicle, are coupled with each other all the time, so as to achieve the same effect as the real air vehicle. The establishment of the new technique overcomes many problems, including the total length of the model is 167 mm, no support for the model, storage of small volume/high-pressure gas in free state, on-time unlocking of sealed gas source in free state of the model, and connection of gas source and nozzle in the model. The test results show that when no jet, the revolution body is head up, which affected by the cavity shock wave. When jet on, the jet force continues to act on the revolution body, resulting in the revolution body lowering its head until it diverges. The new technique can achieve more advanced technical indicators, including: ensuring jet Mach number >1; Ensure that the static pressure ratio of the jet is more than 10 (the static pressure ratio can be greater at hypersonic speed). After the establishment of the new technique, the supersonic wind tunnel test is carried out, and the ideal test results are obtained, which shows that the new technique is reliable.

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“…1 Imperfectly expanded jet is a complicated process containing different compression and expansion waves which forms a diamond shape. 2,3 This phenomenon has been extensively studied experimentally, [4][5][6][7][8] numerically, 2 and analytically [9][10][11][12] ; however, each of the methods has its own limitations to explain the phenomenon completely. The position of the Mach disk is the key subject of experimental works in this area.…”

Section: Introductionmentioning

confidence: 99%

An analytical investigation of transient imperfectly expanded turbulent jet

Ghahremani

Aramfard

Saidi

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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Supersonic turbulent high-pressure jet flows, which are discharging in low-pressure quiescent ambient, are recognized as imperfectly expanded turbulent jet. Steady-state imperfectly expanded jet flow has been already studied analytically; however, the transient flow has not been thoroughly studied. In the present study, the transient imperfectly expanded jet flow with focus on fuel spray in combustion is investigated analytically employing two-step separation of variables method and Fourier-Bessel expansion. The results are validated using available experimental data. The effects of different parameters such as eddy viscosity and pressure ratio on the behavior of the jet are studied. Results show that increasing the eddy viscosity decreases the velocity magnitude and required time to reach fully developed jet. Increasing the pressure ratio almost linearly increases the required time to reach steady state. The density distribution which affects the combustion performance is reported for different axial and radial positions. In the transient region, tip penetration is obtained and validated with the experimental results in the literature, and the velocity profile at different times is presented. The simplicity and accuracy are key advantages of the developed method compared with the experimental and numerical methods. The analytical method proposed in the present research helps to understand the behavior of jet flows from transient to steady state condition without using expensive and time-consuming numerical or experimental techniques.

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New visions in experimental investigations of a supersonic under-expanded jet into a high subsonic crossflow

Cited by 10 publications

References 20 publications

Aero-Propulsive Characterization of a Flight Vehicle with Two Side-Jets

Aero-Propulsive Characterization of a Flight Vehicle with Two Side-Jets

Unsteady test technique of jet control with multi-parameter coupling

An analytical investigation of transient imperfectly expanded turbulent jet

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