流量曲线特点，提出了旋喷泵叶轮的优化设计数学模型、叶轮优化设计方法及水力参数的设计原则。
The mathematical model, the method for optimizing design, and the design principle of hydraulic parameters are proposed to make head-flow curve flat.
论述了锅炉给水除氧器用新型PKXF型可调式旋缝节能喷嘴的结构、主要技术性能参数及基本设计原则。
The paper presents the construction, main technical performance parameters and basic design principles of a new PKXF type adjustable energy-saving gap and vortex deoxygenization sprayer.
以动力学模型和气动模型相匹配为原则，建立了后掠桨尖旋翼的细致气弹模型。
A refined aeroelastic model of a helicopter rotor blade with swept tips is established based on model matching.
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