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Lateral Stability Analysis of Hypersonic Vehicle under Pressure Fluctuation by Solving Mathieu Differential Equation
Lateral Stability Analysis of Hypersonic Vehicle Pressure Fluctuation Mathieu Differential Equation Fluid Dynamics
2012/4/20
Two recent test failures of Hypersonic Technology Vehicle 2 impose a strike to the increasingly growing enthusiasm, not only on the United States side. It is important to find out the exact failure re...
Calculation on Cylinder Pressure Fluctuation by Using the Wave Equation in KIVA Program
combustion pressure oscillation acoustic pressure knock
2011/8/5
Cylinder pressure fluctuation during combustion process of internal combustion engine is closely related to combustion noise and knock. The current studies are based on cylinder pressure test to obtai...
Calculation on Cylinder Pressure Fluctuation by Using the Wave Equation in KIVA Program
combustion pressure oscillation acoustic pressure knock
2011/8/5
Cylinder pressure fluctuation during combustion process of internal combustion engine is closely related to combustion noise and knock. The current studies are based on cylinder pressure test to obtai...
离心泵内部不稳定流场压力脉动特性分析（Analysis on Pressure Fluctuation of Unsteady Flow in a Centrifugal Pump）
离心泵 非定常 压力脉动 RNG k-ε湍流模型
2010/4/1
离心泵内部流场压力脉动是影响机组运行稳定性的关键因素，采用RNG k-ε湍流模型和滑移网格技术研究泵内部非定常流动,得到了不同工况下监测点的压力脉动情况，并对其进行了频域分析。分析结果表明，叶轮与隔舌间的动静干扰是产生压力脉动的主要脉动源，并在整个离心泵流道内传播；且在不同工况下，叶片通过频率均占主导地位，压力面脉动幅值大于吸力面脉动幅值；蜗壳出口同一测面脉动情况近似。 The pressure ...
双蜗壳泵压力脉动特性及叶轮径向力数值模拟（Numerical Simulation of Pressure Fluctuation and Radial Force in a Double Volute Pump）
双蜗壳泵 压力脉动 径向力
2009/11/24
为揭示双蜗壳离心泵的水力不稳定性，采用雷诺时均方法和SST k-ω湍流模型，对一双蜗壳双吸离心泵进行了三维非定常湍流数值模拟，得到了泵内部流场特性及双蜗壳内压力脉动情况，并对其进行了频谱分析。结果表明双蜗壳内存在比较明显的压力脉动。设计工况下压水室内的压力脉动强度小于非设计工况。在设计工况下，隔舌处和隔板区压力脉动频率均以叶片通过频率为主，其中隔板起始端的脉动幅值最大，约为隔舌处的2.5倍。在大流...
基于压力脉动和时序分析的离心泵空化特征提取（Study on the Method of Centrifugal Pump Cavitation Feature Extraction Based on Pressure Fluctuation and Time Serials Analysis）
空化 压力脉动 时间序列 残差
2009/8/11
根据压力脉动幅值对空化变化相当敏感的特点，利用离心式水泵试验平台模拟空化现象，获取水泵出口压力信号。研究发现，在空化发生时刻，水泵出口压力的轴频幅值增大，且存在 很多低频脉动成分。同时，根据试验获取的壳体振动和出口压力信号，分别建立该水泵正常运行的时间序列数学模型，利用模型残差的方差值判别离心泵的运行状态，实现对其空化特征的识别。