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  • 1
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    Computational Fluid Dynamic Modeling of Rocket Based Combined Cycle Engine Flowfields (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Computational Fluid Dynamic techniques are used to study the flowfield of a fixed geometry Rocket Based Combined Cycle engine operating in rocket ejector mode. Heat addition resulting from the combustion of injected fuel causes the subsonic engine flow to choke and go supersonic in the slightly divergent combustor-mixer section. Reacting flow computations are undertaken to predict the characteristics of solutions where the heat addition is determined by the flowfield. Here, adaptive gridding is used to improve resolution in the shear layers. Results show that the sonic speed is reached in the unheated portions of the flow first, while the heated portions become supersonic later. Comparison with results from another code show reasonable agreement. The coupled solutions show that the character of the combustion-based thermal choking phenomenon can be controlled reasonably well such that there is opportunity to optimize the length and expansion ratio of the combustor-mixer.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA Propulsion Engineering Research Center, Volume 2; p 182-188
    Format: application/pdf
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  • 2
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    Software for Refining or Coarsening Computational Grids (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A computer program performs calculations for refinement or coarsening of computational grids of the type called structured (signifying that they are geometrically regular and/or are specified by relatively simple algebraic expressions). This program is designed to facilitate analysis of the numerical effects of changing structured grids utilized in computational fluid dynamics (CFD) software. Unlike prior grid-refinement and -coarsening programs, this program is not limited to doubling or halving: the user can specify any refinement or coarsening ratio, which can have a noninteger value. In addition to this ratio, the program accepts, as input, a grid file and the associated restart file, which is basically a file containing the most recent iteration of flow-field variables computed on the grid. The program then refines or coarsens the grid as specified, while maintaining the geometry and the stretching characteristics of the original grid. The program can interpolate from the input restart file to create a restart file for the refined or coarsened grid. The program provides a graphical user interface that facilitates the entry of input data for the grid-generation and restart-interpolation routines.
    Keywords: Man/System Technology and Life Support
    Type: SSC-00167 , NASA Tech Briefs, October 2003; 17
    Format: application/pdf
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  • 3
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    Software for Refining or Coarsening Computational Grids (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: A computer program performs calculations for refinement or coarsening of computational grids of the type called "structured" (signifying that they are geometrically regular and/or are specified by relatively simple algebraic expressions). This program is designed to facilitate analysis of the numerical effects of changing structured grids utilized in computational fluid dynamics (CFD) software. Unlike prior grid-refinement and -coarsening programs, this program is not limited to doubling or halving: the user can specify any refinement or coarsening ratio, which can have a noninteger value. In addition to this ratio, the program accepts, as input, a grid file and the associated restart file, which is basically a file containing the most recent iteration of flow-field variables computed on the grid. The program then refines or coarsens the grid as specified, while maintaining the geometry and the stretching characteristics of the original grid. The program can interpolate from the input restart file to create a restart file for the refined or coarsened grid. The program provides a graphical user interface that facilitates the entry of input data for the grid-generation and restart-interpolation routines.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NASA/NP-2002-10-00035-SSC , SSC-00167-SM
    Format: text
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  • 4
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    Progress in Valve Modeling at Stennis Space Center (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Efforts to develop the capability to model values used in testing rocket engine components are documented. Cryogenic liquid and gas valves models are presented.
    Keywords: Spacecraft Propulsion and Power
    Type: SE-2002-12-00080-SSC , 14th Annual Symposium on Propulsion; Dec 10, 2002 - Dec 11, 2002; State College, PA; United States
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  • 5
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    Progress in Valve Modeling at Stennis Space Center (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Understanding valve behavior will aid testing of rocket components at Stennis Space Center. The authors of this viewgraph presentation have developed a computational model for a cryogenic liquid control valve, and a gas pressure regulator valve. The model is a compressible/incompressible pressure-based FDNS code from Marshall Space Flight Center (MSFC). It is a k-epsilon turbulence model with wall functions.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: SE-2002-12-00081-SSC , 14th Annual Symposium on Propulsion; Dec 10, 2002 - Dec 11, 2002; State College, PA; United States
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  • 6
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    Computational Modeling of Liquid and Gaseous Control Valves (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In this paper computational modeling efforts undertaken at NASA Stennis Space Center in support of rocket engine component testing are discussed. Such analyses include structurally complex cryogenic liquid valves and gas valves operating at high pressures and flow rates. Basic modeling and initial successes are documented, and other issues that make valve modeling at SSC somewhat unique are also addressed. These include transient behavior, valve stall, and the determination of flow patterns in LOX valves. Hexahedral structured grids are used for valves that can be simplifies through the use of axisymmetric approximation. Hybrid unstructured methodology is used for structurally complex valves that have disparate length scales and complex flow paths that include strong swirl, local recirculation zones/secondary flow effects. Hexahedral (structured), unstructured, and hybrid meshes are compared for accuracy and computational efficiency. Accuracy is determined using verification and validation techniques.
    Keywords: Numerical Analysis
    Type: AIAA Paper 2005-4543 , NASA/NP-2005-07-00065-SSC , 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit; Jul 10, 2005 - Jul 13, 2005; Tucson, AZ; United States
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  • 7
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    Software for Refining or Coarsening Computational Grids (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: A computer program performs calculations for refinement or coarsening of computational grids of the type called 'structured' (signifying that they are geometrically regular and/or are specified by relatively simple algebraic expressions). This program is designed to facilitate analysis of the numerical effects of changing structured grids utilized in computational fluid dynamics (CFD) software. Unlike prior grid-refinement and -coarsening programs, this program is not limited to doubling or halving: the user can specify any refinement or coarsening ratio, which can have a noninteger value. In addition to this ratio, the program accepts, as input, a grid file and the associated restart file, which is basically a file containing the most recent iteration of flow-field variables computed on the grid. The program then refines or coarsens the grid as specified, while maintaining the geometry and the stretching characteristics of the original grid. The program can interpolate from the input restart file to create a restart file for the refined or coarsened grid. The program provides a graphical user interface that facilitates the entry of input data for the grid-generation and restart-interpolation routines.
    Keywords: Computer Programming and Software
    Type: NASA/NP-2002-10-00035-SSC
    Format: text
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  • 8
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    Analyses Of Transient Events In Complex Valve and Feed Systems (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Valve systems in rocket propulsion systems and testing facilities are constantly subject to dynamic events resulting from the timing of valve motion leading to unsteady fluctuations in pressure and mass flow. Such events can also be accompanied by cavitation, resonance, system vibration leading to catastrophic failure. High-fidelity dynamic computational simulations of valve operation can yield important information of valve response to varying flow conditions. Prediction of transient behavior related to valve motion can serve as guidelines for valve scheduling, which is of crucial importance in engine operation and testing. In this paper, we present simulations of the diverse unsteady phenomena related to valve and feed systems that include valve stall, valve timing studies as well as cavitation instabilities in components utilized in the test loop.
    Keywords: Spacecraft Propulsion and Power
    Type: NASA/NP-2005-06-00064-SSC , 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit; Jul 10, 2005 - Jul 13, 2005; Tucson, AZ; United States
    Format: text
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