Pressure oscillations simulation in P80 SRM first stage VEGA launcher

机译：P80 SRM第一阶段VEGA启动器中的压力振荡模拟

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Large solid rocket motors can exhibit sustained pressure and thrust oscillations during the quasi-steady operative condition. These fluctuations are characterized by a frequency close to the first acoustic mode, or one of its multiple, of the combustion chamber. The origin of this phenomenon is the coupling between shear layer instabilities, and acous tic feedback, resulting from the distruction of vorticity by some geometrical features of combustion chamber, as port area variations or nozzle walls. In the present work, a quasi-onedimensional model for the analysis of solid propellant rocket motor aero-acoustic phenomena is described. The proposed model is derived for mally from the Euler conservation laws and it is implemented into a code named AGAR (Aerodynamically Generated Acoustic Resonance). AGAR model is here applied to the P80 SRM, first stage of the European VEGA launcher. The demonstration test, P80 DM, exhibits four phases of pressure oscillations.

机译：大型固体火箭发动机在准稳定运行状态下会表现出持续的压力和推力振荡。这些波动的特征在于接近燃烧室的第一声模或其倍数的频率。这种现象的根源是剪切层不稳定性与声反馈之间的耦合，这是由于燃烧室的某些几何特征（如端口面积变化或喷嘴壁）对涡旋的破坏所致。在本工作中，描述了一种用于分析固体推进剂火箭发动机航空声现象的准一维模型。拟议的模型是根据Euler守恒定律推导得出的，并将其实施为名为AGAR（空气动力学产生的声共振）的代码。这里将AGAR模型应用于欧洲VEGA发射器的第一阶段P80 SRM。演示测试P80 DM表现出四个阶段的压力振荡。

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《AIAA/ASME/SAE/ASEE joint propulsion conference exhibit》|2012年|p.5465-5478|共14页
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V. Ferretti; B. Favini; E. Cavallini; F. Serraglia; M. Di Giacinto;
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正文语种
中图分类航空发动机（推进系统）;
关键词
a: sound velocity; A_p: port area; c_p: specific heat at constant pressure; c_v: specific heat at constant volume; e: total internal energy per unit of mass et al;

机译：a：声速; A_p：端口区域; c_p：恒压比热; c_v：恒定体积的比热; e：单位质量的总内部能量等;

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2. Wind tunnel measurements of the surface pressure fluctuations on the new VEGA-C space launcher [J] . Camussi R., Di Marco A., Stoica C., Aerospace science and technology . 2020,第Apra期

机译：新型VEGA-C空间发射器的风洞测量表面压力波动
3. Simulations of radiation pressure ion acceleration with the VEGA Petawatt laser [J] . Luca C. Stockhausen, Ricardo Torres, Enrique Conejero Jarque Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment . 2016,第sepa11期

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4. NUMERICAL SIMULATIONS OF PRESSURE OSCILLATIONS IN VEGA FIRST STAGE - P80 SRM [C] . F. Paglia, M. Fragnito, E. Lambiase, International astronautical congress;IAC 2008 . 2008

机译：VEGA第一阶段压力振荡的数值模拟-P80 SRM
5. Design and numerical simulation of a linear shaped charge separation mechanism for first stage separation of the Ares I launch vehicle. [D] . Chambers, Nicholas Roy. 2009

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Pressure oscillations simulation in P80 SRM first stage VEGA launcher

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