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无阀两相脉冲爆震发动机循环过程实验分析 被引量:9
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作者 李牧 严传俊 +1 位作者 王治武 邱华 《推进技术》 EI CAS CSCD 北大核心 2007年第1期97-102,共6页
在无阀式以汽油为燃料,空气为氧化剂的脉冲爆震发动机(PDE)模型机上进行了低点火能量多循环实验研究,分析了无阀两相脉冲爆震发动机多循环工作过程。模型机热态试验提供了10~66Hz爆震循环特征时间分配和爆震管内不同位置压力的变... 在无阀式以汽油为燃料,空气为氧化剂的脉冲爆震发动机(PDE)模型机上进行了低点火能量多循环实验研究,分析了无阀两相脉冲爆震发动机多循环工作过程。模型机热态试验提供了10~66Hz爆震循环特征时间分配和爆震管内不同位置压力的变化过程。由于在两相系统中存在较长的点火延迟时间和DDT时间,发现无阀PDE存在较长的点火后填充时间。通过对两相爆震波的形成过程和排出过程的实验研究和分析,以及点火后填充时间,提出了新的无阀PDE特征时间分布。不同频率实验结果表明,从火花塞放电到下一个循环新鲜混合气开始填充这段时间基本不变,称之为极限周期。在该模型中,点火延迟时间和DDT时间占据了极限周期时间的大部分时间.进一步分析了提高循环频率的关键因素。 展开更多
关键词 脉冲爆震发动机 循环 ^特征时间^+ 两相燃烧 ^无阀^+
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Design and Experiment of Streamlined Piezoelectric Pump with Low Vortex and Large Flow Rate 被引量:1
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作者 BIAN Kan HUANG Zhi +4 位作者 BAO Qibo ZHANG Jianhui LAI Liyi CHEN Xiaosheng CHEN Zhenlin 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2020年第1期155-163,共9页
Valveless piezoelectric pump is widely used in the medical,however,there is a general and difficult problem to be solved:Low vortex and large flow rate are not compatible,resulting in the blood prone to thrombosis dur... Valveless piezoelectric pump is widely used in the medical,however,there is a general and difficult problem to be solved:Low vortex and large flow rate are not compatible,resulting in the blood prone to thrombosis during blood delivery.In this paper,a new valveless piezoelectric(PZT)pump with streamlined flow tubes(streamlined pump)is proposed.The design method and the working principle of the pump are analyzed.The velocity streamlines are simulated,and the results demonstrate that there are no obvious vortexes in the flow tube of the streamlined pump.Five prototype pumps(two cone pumps and three streamlined pumps)are designed and fabricated to perform flow rate and flow resistance experiments.The experimental results illustrate that the maximum flow rate of the streamlined pump is 142 mL/min,which is 179%higher than that of the cone piezoelectric pump,demonstrating that the streamlined pump has a large flow rate performance.This research provides an inspiration for future research on simple structure,low vortex and large flow rate volume-type pumps,and also provides a useful solution for thrombosis preventing. 展开更多
关键词 valveless piezoelectric pump streamlined low vortex high flow rate THROMBOSIS
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Effects of structural parameters and rigidity of driving diaphragm on flow characteristics of micro valveless pump
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作者 谢海波 傅新 杨华勇 《Journal of Zhejiang University Science》 EI CSCD 2003年第1期53-57,共5页
The structure and operating principle of micro valveless pump were investigated theoretically and experimentally. The mathematical model of pressure and flow rate within the micro nozzle/diffuser was established to an... The structure and operating principle of micro valveless pump were investigated theoretically and experimentally. The mathematical model of pressure and flow rate within the micro nozzle/diffuser was established to analyze the effects of nozzle/diffuser parameters on the output flow rate of the micro valveless pump.The experiments were carried out with different structural parameters, driving frequencies, vibration amplitudes and stiffness of the driving diaphragms. Effects of the structural parameters and driving conditions on the operation performance of the pump are discussed in detail. The work provides useful reference for structure optimization selection of the driving diaphragm of micro valveless pump. 展开更多
关键词 Micro valveless pump MEMS Driving diaphragm Optimal design
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Theory and experimental verification of valveless piezoelectric pump with rotatable unsymmetrical slopes 被引量:8
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作者 ZHANG JianHui XIA QiXiao +3 位作者 HUANG Yi LENG XueFei HUANG Jun ZHAO ChunSheng 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第11期3070-3077,共8页
A valveless piezoelectric pump with rotatable unsymmetrical slopes is developed in this research.It has the following features:The pump integrates driving and transporting,and it can mix different fluids while transpo... A valveless piezoelectric pump with rotatable unsymmetrical slopes is developed in this research.It has the following features:The pump integrates driving and transporting,and it can mix different fluids while transporting them.In this paper,firstly,the design of the valveless piezoelectric pump with rotatable unsymmetrical slopes was proposed,and the single-direction flow principle was explained.Then,the fluid mechanics model of the valveless piezoelectric pump with rotatable unsymmetrical slopes was established.Meanwhile,the numerical simulation of the pump was performed.Finally,the experiments on relationship between the rotation angles of the slope and the flow rates were conducted.The experimental results showed that the maximum flow was 32.32 mL min 1.The maximum relative error between the theoretical results and the experimental ones was 14.59%.For the relationship between rotation angles and flow ratio of two inlets,the relative error between the experimental and theoretical maxima was 3.75%.Thus,the experiments proved the feasibility of the pump design and verified the theory. 展开更多
关键词 PIEZOELECTRIC PUMP valveless rotatable unsymmetrical slope
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Development of a linear compressor for two-stage pulse tube cryocoolers 被引量:3
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作者 Peng-da YAN Wei-li GAO Guo-bang CHEN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第11期1595-1600,共6页
A valveless linear compressor was built up to drive a self-made two-stage pulse tube cryocooler. With a designed maximum swept volume of 60 cm3, the compressor can provide the cryocooler with a pressure volume (PV) po... A valveless linear compressor was built up to drive a self-made two-stage pulse tube cryocooler. With a designed maximum swept volume of 60 cm3, the compressor can provide the cryocooler with a pressure volume (PV) power of 400 W. Preliminary measurements of the compressor indicated that both an efficiency of 35%~55% and a pressure ratio of 1.3~1.4 could be obtained. The two-stage pulse tube cryocooler driven by this compressor achieved the lowest temperature of 14.2 K. 展开更多
关键词 Linear compressor Linear motor Pulse tube cryocooler
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