脉冲爆震燃气膨胀过程及能量转换难易度评价方法

李晓丰; 肖俊峰; 胡孟起; 王玮; 王峰

doi:10.13224/j.cnki.jasp.20200474

脉冲爆震燃气膨胀过程及能量转换难易度评价方法

doi: 10.13224/j.cnki.jasp.20200474

西安热工研究院有限公司燃气轮机技术部, 西安 710032

基金项目:

陕西省自然科学基金（2020JQ-996）

详细信息

作者简介:
李晓丰(1985-),男,高级工程师,博士,主要从事燃气轮机燃烧技术研究。

中图分类号: V231.2
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- 文章访问数: 118
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- 被引次数: 0
出版历程
- 收稿日期: 2020-11-06
- 刊出日期: 2021-08-28

Pulse detonation gas expansion process and evaluation method of energy conversion difficulty degree

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

摘要

摘要: 为了提高脉冲爆震燃气的能量转换效率，分析了脉冲爆震燃气在涡轮内的膨胀过程，建立了评价爆震燃气能量转换难易度计算方法，并基于脉冲爆震燃烧室与轴流涡轮匹配工作数值模型，采用涡轮效率对燃气能量转换难易度计算方法进行了验证，结果表明： ①爆震波膨胀过程，爆震燃气在涡轮静叶内会产生热壅塞现象，并往上游形成前传压缩波； ②涡轮内爆震燃气的膨胀主要分一次膨胀、过度膨胀和二次膨胀三个阶段，爆震燃气在涡轮内的焓降主要发生在一次膨胀和二次膨胀阶段，在过度膨胀阶段，燃气在涡轮内做负功； ③当量比为0.72、0.89和1.00三种计算工况的燃气能量转换难易度分别为0.396、1.000和0.803，对应的涡轮效率分别为0.473 6、0.597 2和0.570 3，验证了燃气能量转换难易度计算方法的准确性。
- 脉冲爆震燃烧室 /
- 爆震波 /
- 爆震燃烧 /
- 能量转换 /
- 膨胀
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.
- pulse detonation combustor /
- detonation wave /
- detonation combustion /
- energy conversion /
- expansion

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参考文献(19)

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