4篇
您的检索式：作者名="Li Chengqin"
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| 1 | A Study of the Unsteady Tip Flow Field of a Transonic Compressor显示文摘An experimental investigation on the unsteady tip flow field of a transonic compressor rotor has been performed.The casing-mounted high frequency response pressure transducers were arranged along both the blade chord and the blade pitch.The chord-wise ones were used to indicate both the ensemble averaged and time varying flow structure of the tip region of the rotor at different operating points under 95% design speed and 60% design speed.The pitch-wise circumferential transducers were mainly used to analyze the unsteadiness frequency of the tip leakage flow in the rotor frame at the near stall condition.The contours of casing wall pressure show that there were two clear low pressure regions in blade passages,one along the chord direction,caused by the leakage flow and the other along the tangential direction,maybe caused by the forward swept leading edge.Both low pressure regions were originated from the leading edge and formed a scissor-like flow pattern.At 95% design speed condition,the shock wave interacted with the low pressure region and made the flow field unsteady.With the mass flow reduced,the two low pressure regions gradually contracted to the leading edge and then a spike disturbance emerged. | JingXuan Zhang Chengqin Li Hongwu Zhang Weiguang Huang | 2011 | Journal of Thermal Science2011，20，1： | 3 |
| 2 | Principles ofexergy analysis in HVAC and evaluation of evaporativecooling schemes 显示文摘 | Ren Chengqin Li Nianping Tang Guangfa | 2002 | Building and Environment2002，37，： | 1 |
| 3 | Review of Public-Key Cryptosystem Based on the Error Correcting Code显示文摘The paper review the public-key cryptosystems based on the error correcting codes such as Goppa code, BCH code, RS code, rank distance code, algebraic geometric code as well as LDPC code, and made the comparative analyses of the merits and drawbacks of them. The cryptosystem based on Goppa code has high security, but can be achieved poor. The cryptosystems based on other error correcting codes have higher performance than Goppa code. But there are still some disadvantages to solve. At last, the paper produce an assumption of the Niederreiter cascade combination cryptosystem based on double public-keys under complex circumstances, which has higher performance and security than the traditional cryptosystems. | LI Zhongyuan QU Chengqin ZHOU Xueguang ZHUO Lifeng | 2014 | Wuhan University Journal of Natural Sciences2014，19，6： | 1 |
| 4 | Titania-coated polystyrene hybrid microballs prepared with miniemulsion polymerization显示文摘 | Zhang Ming Gao Ge Li Chengqin | 2004 | Langmuir2004，20，： | 1 |
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