Direct calculation of high-speed cavity flows in a scramjet engine by the CESE method

2002 ◽  
Author(s):  
C.-K. Kim ◽  
K.-S. Im ◽  
S.-T. Yu
Keyword(s):  
High Speed ◽  
Direct Calculation ◽  
Cavity Flows ◽  
Scramjet Engine

Simulation of High-Speed Cavity Flows in a Scramjet Engine by the Space-Time CESE Method

2005 ◽  
Author(s):  
Shaeng-Tao J. Yu ◽  
Chang-Kee Kim ◽  
Zeng-Chan Zhang
Keyword(s):  
High Speed ◽  
Space Time ◽  
Cavity Flows ◽  
Scramjet Engine

Using High-Frequency Pulsed Supersonic Microjets to Control Resonant High-Speed Cavity Flows

AIAA Journal ◽  
2020 ◽  
Vol 58 (8) ◽  
pp. 3378-3392
Author(s):  
Phillip A. Kreth ◽  
Farrukh S. Alvi
Keyword(s):  
High Frequency ◽  
High Speed ◽  
Cavity Flows

Finite Element Analysis on the Structure Strength of Air Cushion Vehicle

2014 ◽  
Vol 918 ◽  
pp. 95-100 ◽  
Author(s):  
Ning Liu ◽  
Hui Long Ren ◽  
Jian Zhang Li ◽  
Lian Hui Jia
Keyword(s):  
High Speed ◽  
Normal Load ◽  
Structural Response ◽  
Fem Analysis ◽  
Direct Calculation ◽  
Wave Loads ◽  
Loading Test ◽  
Element Analysis ◽  
Air Cushion ◽  
Air Cushion Vehicle

Air Cushion Vehicle is widely used in the field of military and civil ship in recent years for its characteristic high speed and amphibian. Since the yield strength of aluminum sheet with stiffeners is relative low after welding, to ensure air cushion vehicle has significant strength under normal load and to avoid severe damage under adverse sea conditions, model loading test and theoretical prediction is used to determines the design values of wave loads, and FEM analysis with direct calculation method under the different load cases including the total longitudinal strength, cross-strength, torsional strength and shear strength, and then getting the structural response results. This essay gives several suggestions for the design according to the calculated results of stress and its deformation characteristics.

Cavity Flows in a Scramjet Engine by the Space-Time Conservation and Solution Element Method

AIAA Journal ◽  
2004 ◽  
Vol 42 (5) ◽  
pp. 912-919 ◽  
Author(s):  
Chang-Kee Kim ◽  
S.-T. John Yu ◽  
Zeng-Chan Zhang
Keyword(s):  
Space Time ◽  
Cavity Flows ◽  
Scramjet Engine ◽  
Solution Element ◽  
Element Method

Direct Calculation of The Design of High-Speed Craft

2001 ◽  
Author(s):  
Anders Rosen ◽  
◽  
Karl Garme ◽  
Keyword(s):  
High Speed ◽  
Direct Calculation

CFD Analysis of the Combustion of Hydrogen in a Simulated Two Dimensional Scramjet Engine

2004 ◽  
Author(s):  
J. K. Rencher ◽  
A. H. Massoudi ◽  
D. W. Guillaume
Keyword(s):  
High Speed ◽  
Premixed Combustion ◽  
Research Center ◽  
Test Facility ◽  
Published Data ◽  
Two Dimensional ◽  
Hydrogen Fuel ◽  
Engine Model ◽  
Scramjet Engine ◽  
Langley Research Center

The purpose of this research is to accurately simulate combustion in a scramjet engine using a CFD (Computational Fluid Dynamics) software package called Fluent and to validate the results with existing experimental data from NASA Langley Research Center[1]. The use of a particular engine characteristic called compression ramp injection was used to increase the mixing of air and fuel inside the combustion duct as well as provide the necessary compression of the fuel/air mixture. The duct length and other pertinent dimensions were also determined by published data from NASA [1]. The engine model used is relatively small and, at this stage, can be thought of as a two dimensional combustor duct rather than a true engine. The scope of this project involves the simultaneous calculations and analysis of both combustion and high-speed compressible flow. Thermodynamic data was used to create hydrogen fuel in a Fluent module called prePDF (probability density function), which calculates the look-up tables and chemical reactions for the fuel. Non-premixed combustion at Mach 2 was carried out using various equivalence ratios, (ratio of actual fuel/air mixture to stoichiometric fuel/air mixture) ranging from .4 to 1.4. The basic characteristics of the numerical model are as follows: steady state; non-premixed combustion; hydrogen fuel PDF model with 4 species; k-epsilon viscous model. Results of the numerical analysis include a comparison of combustion efficiencies for various equivalence ratios to the combustion efficiencies and equivalence ratios obtained by NASA in their experimental ground test facility at Langley Research Center [1].

Fatigue Assessment of Trimaran Structure Based on Simplified Procedure

2012 ◽  
Vol 525-526 ◽  
pp. 333-336
Author(s):  
Hui Long Ren ◽  
Shehzad Khurram ◽  
Chun Bo Zhen ◽  
Khurram Asifa
Keyword(s):  
Fatigue Damage ◽  
High Speed ◽  
Hot Spot ◽  
Mathematical Formulation ◽  
Direct Calculation ◽  
Assessment Procedure ◽  
Hot Spot Stress ◽  
Fatigue Assessment ◽  
Strength Assessment ◽  
Simplified Procedure

In recent years, Trimaran platform design has got the attention of naval architects owing to its superior seagoing performance. Trimaran structure experiences severe loads due to its unique configuration and high speed, causing stress concentration, especially in cross deck region and accelerate fatigue damage. This paper presents fatigue strength assessment of Trimaran structure by simplified procedure. A methodology is proposed to evaluate fatigue loads and loading conditions by load combinations of direct calculation procedure of Lloyds Register Rules for Classification of Trimaran (LR Rules). Global FE analysis, in ANSYS, is performed to investigate the stress response. The stress range is computed by hot-spot stress approach, and its long term distribution is specified by Weibull distribution. Fatigue damage of selected critical details is calculated using mathematical formulation of simplified fatigue assessment procedure of Common Structure Rules (CSR).

Numerical Simulations of High-Speed Turbulent Cavity Flows

2009 ◽  
Vol 83 (4) ◽  
pp. 569-585 ◽  
Author(s):  
G. N. Barakos ◽  
S. J. Lawson ◽  
R. Steijl ◽  
P. Nayyar
Keyword(s):  
Numerical Simulations ◽  
High Speed ◽  
Cavity Flows
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