NASA Technical Reports Server (NTRS) 20060024984: Baseline Computational Fluid Dynamics Methodology For Longitudinal-Mode Liquid-Propellant Rocket Combustion Instability - Info and Reading Options
By NASA Technical Reports Server (NTRS)
"NASA Technical Reports Server (NTRS) 20060024984: Baseline Computational Fluid Dynamics Methodology For Longitudinal-Mode Liquid-Propellant Rocket Combustion Instability" and the language of the book is English.
“NASA Technical Reports Server (NTRS) 20060024984: Baseline Computational Fluid Dynamics Methodology For Longitudinal-Mode Liquid-Propellant Rocket Combustion Instability” Metadata:
- Title: ➤ NASA Technical Reports Server (NTRS) 20060024984: Baseline Computational Fluid Dynamics Methodology For Longitudinal-Mode Liquid-Propellant Rocket Combustion Instability
- Author: ➤ NASA Technical Reports Server (NTRS)
- Language: English
Edition Identifiers:
- Internet Archive ID: NASA_NTRS_Archive_20060024984
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"NASA Technical Reports Server (NTRS) 20060024984: Baseline Computational Fluid Dynamics Methodology For Longitudinal-Mode Liquid-Propellant Rocket Combustion Instability" Description:
The Internet Archive:
A computational method for the analysis of longitudinal-mode liquid rocket combustion instability has been developed based on the unsteady, quasi-one-dimensional Euler equations where the combustion process source terms were introduced through the incorporation of a two-zone, linearized representation: (1) A two-parameter collapsed combustion zone at the injector face, and (2) a two-parameter distributed combustion zone based on a Lagrangian treatment of the propellant spray. The unsteady Euler equations in inhomogeneous form retain full hyperbolicity and are integrated implicitly in time using second-order, high-resolution, characteristic-based, flux-differencing spatial discretization with Roe-averaging of the Jacobian matrix. This method was initially validated against an analytical solution for nonreacting, isentropic duct acoustics with specified admittances at the inflow and outflow boundaries. For small amplitude perturbations, numerical predictions for the amplification coefficient and oscillation period were found to compare favorably with predictions from linearized small-disturbance theory as long as the grid exceeded a critical density (100 nodes/wavelength). The numerical methodology was then exercised on a generic combustor configuration using both collapsed and distributed combustion zone models with a short nozzle admittance approximation for the outflow boundary. In these cases, the response parameters were varied to determine stability limits defining resonant coupling onset.
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