Altitude compensating nozzle evaluation

Parsley, R. C.; Stelle, K. J. van

doi:10.2514/6.1992-3456

Cited by 9 publications

(2 citation statements)

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“…In order to improve the thrust performance of rocket engine nozzles and compensate for thrust losses caused by back pressure changes during operation, various altitude compensation nozzle concepts have been proposed and gained widespread attention from the scientific and engineering community [4]. Typical altitude compensation nozzles include dual-bell nozzles [5], expansion-deflection nozzle [6], extending nozzles [7], aerospike nozzles [8], vented nozzles [9], and slotted nozzles [10]. The different configurations of these altitude compensation nozzles give very different altitude compensation mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on altitude-compensating mechanism of a permeable nozzle

Xue,

Bu,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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A conceptual adaptive altitude compensation nozzle with a permeable wall (permeable nozzle for short) is proposed in the present study. The typical operating states of the nozzle are demonstrated using numerical methods and the underlying mechanism of its altitude compensation is interpreted. The numerical results show that, at low nozzle pressure ratios, the external atmosphere enters the nozzle through its permeable wall section, which inhibits the backflow at the nozzle wall, weakens the strength of the separated oblique shock, thus improves the low-altitude thrust performance of the nozzle. However, at high nozzle pressure ratios, the exhaust gas leaves the nozzle through its permeable wall, which weakens the expansion of the exhaust gas and reduces the thrust performance. The permeable nozzle is considered to possess altitude compensation ability when the enhancement in its low-altitude thrust performance surpasses the deterioration in high-altitude thrust performance. The thrust composition analysis of the permeable nozzle reveals that its altitude compensation ability derives from the internal pressure rise due to the atmospheric air penetration into the nozzle at low nozzle pressure ratios.

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Section: Introductionmentioning

confidence: 99%

Numerical study on altitude-compensating mechanism of a permeable nozzle

Xue,

Bu,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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“…In fact, aerospike nozzles provide, at least theoretically, continuous altitude adaptation up to their geometrical area ratio. For high area ratio nozzles with relatively short length, plug nozzles perform better than conventional bell nozzles [2,3]. For these reasons, experimental, analytical and numerical research on plug nozzles have been performed since the 50s worldwide.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental assessment of a linear aerospike

Resta

2023

Materials Research Proceedings

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Abstract. In the present work a linear aerospike nozzle model has been studied with cold flow experiments in various working conditions. A series of numerical 3D RANS simulations have been performed in order to directly compare numerical and experimental results. Mean pressure distributions have been measured on the nozzle model symmetry plane, in order to characterize the flow evolution along the walls of the plug. The presented results show a good agreement between numerical and experimental results.

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