scholarly journals Supersonic Cavity Flow Subjected to Continuous and Transient Leading-Edge Blowing

AIAA Journal ◽  
2020 ◽  
Vol 58 (10) ◽  
pp. 4415-4425
Author(s):  
Aaron M. Turpin ◽  
Daniel Chin ◽  
Kenneth Granlund
Keyword(s):  
Leading Edge ◽  
Cavity Flow ◽  
Supersonic Cavity

scholarly journals Numerical Laser Energy Deposition on Supersonic Cavity Flow and Sensor Placement Strategies to Control the Flow

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Ibrahim Yilmaz ◽  
Selin Aradag
Keyword(s):  
Energy Deposition ◽  
Laser Energy ◽  
Leading Edge ◽  
Cavity Flow ◽  
Time Flow ◽  
Computational Fluid Dynamics Simulations ◽  
Dynamics Simulations ◽  
Proper Orthogonal ◽  
The Impact ◽  
Supersonic Cavity

In this study, the impact of laser energy deposition on pressure oscillations and relative sound pressure levels (SPL) in an open supersonic cavity flow is investigated. Laser energy with a magnitude of 100 mJ is deposited on the flow just above the cavity leading edge and up to 7 dB of reduction is obtained in the SPL values along the cavity back wall. Additionally, proper orthogonal decomposition (POD) method is applied to thex-velocity data obtained as a result of computational fluid dynamics simulations of the flow with laser energy deposition. Laser is numerically modeled using a spherically symmetric temperature distribution. By using the POD results, the effects of laser energy on the flow mechanism are presented. A one-dimensional POD methodology is applied to the surface pressure data to obtain critical locations for the placement of sensors for real time flow control applications.

Steady Performance of a Flexible Hydrofoil Near a Free Surface

1990 ◽  
Vol 34 (04) ◽  
pp. 302-310
Author(s):  
Salwa M. Rashad ◽  
Theodore Green
Keyword(s):  
Mathematical Model ◽  
Free Surface ◽  
Cavity Length ◽  
Leading Edge ◽  
Cavity Flow ◽  
Cavitation Number ◽  
Deformation Characteristics ◽  
Flow Depth ◽  
Lift And Drag ◽  
The Galerkin Method

A linearized cavity-flow theory is used to develop a mathematical model to study the steady characteristics of a flexible hydrofoil near a free surface. The Galerkin method is employed to account for the mutual interaction between the fluid and structure forces. Cheng and Rott's method [1]2 is used to derive general expressions for the deformation characteristics in steady flow of an arbitrarily shaped hydrofoil, with a clamped trailing edge and free leading edge. From the analysis it is possible to determine the lift and drag coefficients, cavity length, and the foil steady deformation for any given specific foil shape, cavitation number, angle of attack, flow depth/chord ratio and rigidity. Sample numerical results are given, and the effects of flexibility and the proximity of the free surface are discussed. Chordwise flexibility tends to increase drag and decrease lift coefficients. This effect is more serious near the free surface. A slight increase of the thickness near the leading edge diminishes the flexibility effects.

Control of Pressure Oscillations Induced by Supersonic Cavity Flow

AIAA Journal ◽  
2020 ◽  
Vol 58 (5) ◽  
pp. 2070-2077 ◽  
Author(s):  
Wang Xiansheng ◽  
Yang Dangguo ◽  
Liu Jun ◽  
Zhou Fangqi
Keyword(s):  
Cavity Flow ◽  
Pressure Oscillations ◽  
Supersonic Cavity

scholarly journals Investigation of store separation characteristics by leading edge spoilers before supersonic cavity

2020 ◽  
Vol 1600 ◽  
pp. 012017
Author(s):  
Pengcheng Cui ◽  
Bin Li ◽  
Jing Tang ◽  
Jiangtao Chen ◽  
Huan Li ◽  
...  
Keyword(s):  
Leading Edge ◽  
Store Separation ◽  
Supersonic Cavity

scholarly journals Numerical Simulation of Aero-Optical Effects in a Supersonic Cavity Flow

AIAA Journal ◽  
2017 ◽  
Vol 55 (9) ◽  
pp. 3095-3108 ◽  
Author(s):  
Ilya A. Zilberter ◽  
Jack R. Edwards ◽  
Donald J. Wittich
Keyword(s):  
Numerical Simulation ◽  
Cavity Flow ◽  
Optical Effects ◽  
Supersonic Cavity

A Nonaxisymmetric Endwall Design Methodology for Turbine Nozzle Guide Vanes and its Computational Fluid Dynamics Evaluation

2011 ◽  
Author(s):  
O¨zhan H. Turgut ◽  
Cengiz Camcı
Keyword(s):  
Total Pressure ◽  
Design Methodology ◽  
Computational Study ◽  
Guide Vane ◽  
Leading Edge ◽  
Cavity Flow ◽  
Subsequent Paper ◽  
Rotor Stator Interaction ◽  
Endwall Contouring ◽  
Nozzle Guide

Nonaxisymmetric endwall contouring has recently become one of the ways to minimize the secondary flow related losses in a turbine nozzle guide vane (NGV) passage. In this study, a specific nonaxisymmetric endwall contouring design methodology is introduced. Fourier series based splines at different axial locations are generated and combined with the help of stream-wise B-splines within solid modeling program. Eight different contoured endwalls are presented in this paper. Computational study of these designs are performed by the finite-volume flow solver. The SST k–ω turbulence model is selected and a body-fitted structured grid is used. Total pressure distribution at the NGV exit shows that contouring the endwall effectively changes the results. Among from these various designs, the most promising one is with the contouring extended in the upstream of the vane leading edge. Mass-averaged value of 3.2% total pressure loss reduction is achieved at the NGV exit plane. The current study was performed in a rotating turbine rig simulating a state of the art HP turbine stage. An NGV only simulation is performed. This approach is helpful in isolating rotor-stator influence and the possible upstream flow modifications of the rim seal cavity flow existing in the rotating turbine research rig. The investigation including the rotor-stator interaction and rim seal cavity flow is the topic of a subsequent paper currently under progress.

ANALYSIS OF THE EFFECTS OF MASS-INJECTION AT THE LEADING EDGE ON CAVITY FLOW CHARACTERISTICS

2009 ◽  
Vol 23 (03) ◽  
pp. 413-416 ◽  
Author(s):  
JI FEI WU ◽  
ZHAO LIN FAN ◽  
XIN FU LUO
Keyword(s):  
High Speed ◽  
Static Pressure ◽  
Flow Characteristics ◽  
Leading Edge ◽  
Cavity Flow ◽  
Fluctuating Pressure ◽  
Pressure Distributions ◽  
Mass Injection ◽  
Varying Mass ◽  
Hole Number

An experimental investigation was conducted in a high speed wind tunnel to explore the effects of mass-injection on cavity flow characteristics. Detailed static-pressure and fluctuating pressure measurements were obtained at the cavity floor to enable the effects of the mass-injection at the leading edge to be determined. Results indicate that varying mass-injection hole number and the flux rate of mass-injection has no significant effect on cavity flow characteristics. However, mass-injection can reduce the cavity static pressure gradient when the cavity flow type is transitional-cavity flow. The study also indicates that Mach number can influence the effect of mass-injection on cavity fluctuating pressure distributions, and at supersonic speeds, mass-injection can suppress the cavity tones effectively.

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