Liquid Propulsion with Altitude Compensation Concept Trade Study
- Paper number
IAC-06-C4.1.09
- Author
Prof. Vasily Semenov, Moscow Aviation Institute (MAI), Russia
- Coauthor
Prof. Sergey L. Finogenov, Moscow Aviation Institute (MAI), Russia
- Coauthor
Dr. Igor Ivanov, Moscow Aviation Institute (MAI), Russia
- Coauthor
Dr. Andrew Talalaev, Moscow Aviation Institute (MAI), Russia
- Year
2006
- Abstract
Modern engines for heavy launchers run from a sea level up to space in conditions of variable ambient pressure. Nozzles of such engines operate at off-rated operating modes and exhibit noticeable specific impulse losses, which force to modernize conventional rocket nozzles with fixed expansion area ratio. Numerous means of regulation of nozzle altitude characteristics have been offered for gas overexpansion elimination. However, all of these designs possess a series of demerits. Therefore more perspective solution of altitude characteristics regulation is use for the first stage engines a nozzle with high expansion ratio with one or several narrow annular slots created in the nozzle divergent part. During ascend in a dense atmosphere separation of gas flow from the wall occurs at cross-section where the annular slot is located. Consequent inclusion into operation of separate parts of the nozzle during the flight causes the altitude characteristics to be closer to those for nozzle with ideal altitude compensation. For estimation of efficiency of rocket engine with such a slot nozzle with altitude compensation, the method of solution of the process of gas flow in bell nozzles with flow separation is suggested. Mathematical model for calculation of gas flow in the nozzle with flow separation uses the system of 2-D non-stationary Navier-Stokes equations with the specified boundary conditions. The explicit quasi-monotonic numerical scheme of higher order of accuracy (modification of the Godunov scheme) is used. Acknowledgments: The presented research is performed under the support and within the frames of the ISTC Project 2598.
- Abstract document
- Manuscript document
IAC-06-C4.1.09.pdf (🔒 authorized access only).
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