SBIR Phase I: Design-Based Developments for Pump Cavitation Control

9861213 这个小企业创新研究（SBIR）第一阶段项目将开发高性能空化泵诱导轮和叶轮的设计工具。 将采用一种创新的诱导轮设计方法，采用弓形叶片、后掠和冲角，加上罩面处理概念。 在实验室试验中，第一阶段将探索叶片形状、载荷和空化之间的权衡。 将在实验室中通过稳态和动态测量以及流动显示技术研究叶片设计参数，如密实度、前缘形状（后掠角）、倾斜角、叶尖速度以及间隙和厚度效应。 设计工具，包括计算流体动力学（CFD），将被评估为非空化和空化性能建模，以进一步了解这个设计问题。 由于空化设计的限制，泵目前必须在低速下运行，因此它们在宽流量范围内的效率和可靠运行方面受到限制。 这些新的设计工具有望有效地模拟空化性能，从而推进火箭推进技术，克服当前工业泵的限制。 商业应用预计在航空航天和工业泵公司。 预期的技术和设计工具将通过设计软件系统介绍给工业和火箭发动机涡轮泵制造商。 由于工业泵消耗的能量约为车辆使用的能量的四分之一，因此泵效率的预期提高也可能转化为显著的节能。

9861213 This Small Business Innovative Research (SBIR) Phase I project will develop design tools for high- performance cavitating pump inducers and impellers. An innovative inducer design approach will be taken using bowed blading, sweep, and incidence, plus cover treatment concepts. In laboratory tests Phase I will explore tradeoffs between blade shape, loading, and cavitation. Blade design parameters such as solidity, leading edge shape (sweep), cant angle, tip speed, and clearance and thickness effects will be investigated in the laboratory by means of steady and dynamic measurements and flow visualization techniques. Design tools, including computational fluid dynamics (CFD), will be evaluated for modeling both non-cavitating and cavitating performance to understand this design problem further. Since pumps must currently be operated at low speed due to cavitation design limitations, they are limited in efficiency and reliable operation over a wide flow range. These new design tools are expected to model cavitation performance effectively and thereby to advance rocket propulsion technologies and overcome current industrial pump limits. Commercial applications are expected in aerospace and industrial pump companies. The anticipated technology and design tools will be introduced to industrial and rocket engine turbopump manufacturers via a a design software system. Since energy consumed by industrial pumps is about one-quarter of that used by vehicles, the expected improvements in pump efficiency may also tranlate into significant energy conservation.