Volume 36 Issue 8
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LI Xiaofeng, XIAO Junfeng, HU Mengqi, WANG Wei, WANG Feng. Pulse detonation gas expansion process and evaluation method of energy conversion difficulty degree[J]. Journal of Aerospace Power, 2021, 36(8): 1586-1593. doi: 10.13224/j.cnki.jasp.20200474
Citation: LI Xiaofeng, XIAO Junfeng, HU Mengqi, WANG Wei, WANG Feng. Pulse detonation gas expansion process and evaluation method of energy conversion difficulty degree[J]. Journal of Aerospace Power, 2021, 36(8): 1586-1593. doi: 10.13224/j.cnki.jasp.20200474
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Pulse detonation gas expansion process and evaluation method of energy conversion difficulty degree

doi: 10.13224/j.cnki.jasp.20200474

  • Gas Turbine Technology Department, Xi'an Thermal Power Research Institute Company Limited, Xi'an 710032, China

  • Received Date: 2020-11-06
  • Publish Date: 2021-08-28
    Abstract
  • In order to improve the energy conversion efficiency of pulse detonation gas, the expansion process of pulse detonation gas in the turbine was analyzed, and a calculation method for evaluation method of energy conversion difficulty degree was established. Based on the numerical model of the pulse detonation combustor with the axial turbine, the turbine efficiency was adopted to verify the calculation method for gas energy conversion difficulty degree. The results showed that:(1) in the process of detonation wave expansion,the thermal choking phenomenon appeared in the turbine static vane and formed a back-propagating compression wave.(2) The expansion of the detonation gas in the turbine was mainly comprised of primary expansion, over-expansion and secondary expansion; the enthalpy drop of the detonation gas in the turbine mainly occurred in the primary and secondary expansion stages. In the over-expansion stage,the gas did negative work in the turbine.(3) The gas energy conversion difficulty degrees for the three calculation conditions with equivalent ratios of 0. 72, 0. 89 and 1. 00 were 0. 396, 1. 000 and 0. 803, respectively, and the turbine efficiency for the three calculation conditions was 0. 473 6, 0. 597 2 and 0. 570 3, respectively, verifying the accuracy of the calculation method for gas energy conversion difficulty degree.

     

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