Contrastive study on cool flow resistance characteristics between single-channel and three-channel diffuser
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摘要:
为了给高温升燃烧室扩压器选型提供技术支撑，以某高温升燃烧室全环试验件为平台，获得进口总压500 kPa以及进口温度500 K条件下的单通道三通道扩压器与三通道扩压器燃烧室的总压损失特性随燃烧室进口马赫数的变化规律，同时借助CFD技术开展数值仿真，试验与数值仿真结果对比表明：相同状态下，单通道扩压器燃烧室方案扩压器、火焰筒以及燃烧室总压损失均低于三通道扩压器方案，设计点条件下扩压器、火焰筒以及燃烧室总压损失分别降低了0.13%、0.02%以及0.16%；所选的数值仿真方法可用于评估燃烧室冷态流阻特性变化趋势，但无法准确评估总压损失绝对值。
Abstract:In order to provide technical support for the selection of diffuser of high-temperature rise combustor, with a high-temperature rise full annular test piece taken as the test platform, the total pressure loss characteristics varying with the combustor import Mach number of the single-channel and three-channel diffuser combustors under inlet total pressure 500 kPa and inlet temperature 500 K, and numerical simulation was conducted by means of CFD technology as well. The comparison between the experimental and numerical simulation results showed that: the total pressure loss of diffuser, flame tube, and combustor in the single-channel diffuser combustor was lower than that in the three-channel diffuser combustor, the total pressure loss of diffuser, flame tube and combustor was reduced by 0.13%, 0.02% and 0.16%, separately at the design point; the selected numerical simulation method could be used to evaluate the variation trend of cold flow resistance characteristics of combustor, but it could not accurately evaluate the absolute value of total pressure loss.
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Key words:
- single-channel /
- three-channel /
- diffuser /
- cool flow resistance /
- total pressure loss
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图 1 全环燃烧室试验件示意图
Figure 1. Schematic diagram of full annular combustor experiment system
图 2 测点分布示意图（逆航向）
Figure 2. Schematic diagram of measuring point distribution （reverse course）
图 3 单通道扩压器燃烧室冷态流阻特性
Figure 3. Cool flow resistance characteristics of single-channel diffuser combustor
图 4 三通道扩压器燃烧室冷态流阻特性
Figure 4. Cool flow resistance characteristics of three-channel diffuser combustor
图 9 单通道扩压器燃烧室冷态流阻特性计算结果
Figure 9. Calculation results of single-channel diffuser combustor about cool flow resistance characteristics
图 10 三通道扩压器燃烧室冷态流阻特性计算结果
Figure 10. Calculation results of three-channel diffuser combustor about cool flow resistance characteristics
图 12 单通道扩压器燃烧室计算与试验结果对比
Figure 12. Comparison between experiment and calculation of single-channel diffuser combustor
图 13 三通道扩压器燃烧室计算与试验结果对比
Figure 13. Comparison between experiment and calculation of three-channel diffuser combustor
图 14 计算结果与设计值差值
Figure 14. Differences between the calculated results and the design value
表 1 试验状态列表
Table 1. Test status list
序号 进气温度/K 进气压力/kPa 进气流量/（kg/s） 1 500 500 1.312 2 500 500 1.212 3 500 500 1.112 4 500 500 1.012 5 500 500 0.912 
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表 2 设计点总压损失对比
Table 2. Comparison of total press loss under design point
% 扩压器 ${\xi _{{\rm{dif}}} }$ ${\xi _{{\rm{ft}}} }$ ${\xi _{\rm{c}}}$ 单通道 3.20 3.53 6.61 三通道 3.33 3.55 6.77
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表 3 计算边界条件
Table 3. Computational boundary conditions
位置 边界条件 温度/K 压力/kPa 流量（/kg/s） 进口 质量进口 500 500 1.312 1.212 1.112 1.012 0.912 出口 流动出口 侧壁 周期边界
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表 4 设计点总压损失计算结果对比
Table 4. Comparison of total press loss calculation results under design point
% 扩压器 ${\xi _{{\rm{dif}}} }$ ${\xi _{{\rm{ft}}} }$ ${\xi _{\rm{c}}}$ 单通道 1.27 3.58 4.8 三通道 1.85 3.62 5.4
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表 5 设计点总压损失修正前后对比
Table 5. Comparison of total press loss under design point before and after correction
% 名称 扩压器 ${\xi _{{\rm{dif}}} }$ ${\xi _{{\rm{ft}}} }$ ${\xi _{\rm{c}}}$ 修正前 单通道 3.20 3.53 6.61 三通道 3.33 3.55 6.77 修正后 单通道 2.85 3.84 6.58 三通道 2.99 3.86 6.74 差值 单通道 0.35 −0.31 0.03 三通道 0.34 −0.31 0.03
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