条缝喷嘴几何结构对旋流冷却特性的影响

马永乐; 成克用; 淮秀兰

doi:10.13224/j.cnki.jasp.20210385

条缝喷嘴几何结构对旋流冷却特性的影响

doi: 10.13224/j.cnki.jasp.20210385

马永乐^{1, 2, 4},
成克用^{1, 2, 3,*, ,},
淮秀兰^{1, 2, 4}

1.
中国科学院工程热物理研究所，北京 100190
2.
中科南京未来能源系统研究院，南京 211135
3.
中国科学院大学南京学院，南京 211135
4.
中国科学院大学工程科学学院，北京 100049

基金项目: 工信部国家科技重大专项（2017-Ⅲ-0003-0027）

详细信息

作者简介:
马永乐（1993-），男，硕士生，主要从事燃气轮机透平叶片流动传热研究

通讯作者:
成克用（1984-），男，高级工程师，博士，主要从事高效紧凑式换热器及燃机部件高温冷却研究。E-mail：chengkeyong@iet.cn

中图分类号: V231.1
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-21
- 网络出版日期: 2023-10-16

Effects of slot nozzle geometry on the cooling characteristics of swirl flow

MA Yongle^{1, 2, 4},
CHENG Keyong^{1, 2, 3,*
, ,},
HUAI Xiulan^{1, 2, 4}

1.
Institute of Engineering Thermophysics，Chinese Academy of sciences，Beijing 100190，China
2.
Nanjing Institute of Future Energy System， Chinese Academy of sciences，Nanjing 211135，China
3.
University of Chinese Academy of Sciences，Nanjing 211135，China
4.
School of Engineering Science，University of Chinese Academy of Sciences，Beijing 100049，China

摘要

摘要:
为了寻求更优的透平叶片前缘冷却结构，建立了条缝喷嘴旋流冷却结构，并选用标准k-ε湍流模型进行数值计算，探究了条缝喷嘴几何结构对旋流冷却流动与换热特性的影响。在所研究雷诺数范围内，条缝喷嘴旋流冷却靶面换热流向不均匀度比离散结构小67.8%～71.9%；条缝喷嘴旋流冷却靶面换热强度在喷嘴范围内沿流向呈上升趋势；通过改变条缝喷嘴截面斜度角可以有效影响靶面换热分布，当斜度角为0.24 rad时，换热强度沿流向基本呈均匀分布，超过此值，则呈下降趋势；条缝喷嘴高度对旋流冷却换热均匀性影响较为明显，当喷嘴高度是水力直径3.41倍时，综合性能最好；此外，还探究了条缝喷嘴宽度对旋流冷却的影响。
- 燃气轮机 /
- 叶片前缘 /
- 条缝喷嘴 /
- 旋流冷却 /
- 流动传热
Abstract:
To find the optimized cooling structure of turbine blade leading edge, the swirl cooling structure with slot nozzle was established and numerical simulations with the standard k-ε turbulence model were adopted to survey the influence of slot nozzle on the flow and heat transfer characteristics of swirl cooling. Within the studied range of Reynolds number, the non-uniformity of heat transfer for the slot nozzle swirl cooling was 67.8%−71.9% lower than that of the disperse jet swirl cooling along the axial direction. Within the range of the nozzle, the heat transfer intensity of the slot nozzle swirl cooling showed an upward trend along the flow direction. The heat transfer of the bottom surface could be effectively influenced by the inclination angle of the cross-section trapezoid of slot nozzle. When the inclination angle of the cross-section trapezoid was 0.24rad, the heat transfer intensity was uniformly distributed, and showed a downward trend when the inclination angle of the cross-section trapezoid exceeded 0.24rad. Once the angle was larger than 0.24rad, the heat transfer intensity decreased. The slot nozzle height had important effect on the uniformity of heat transfer of swirl cooling and the comprehensive performance was obtained when the height was 3.41 times of the diameter. In addition, the influence of width of the slot nozzle on the swirl cooling was explored.
- gas turbine /
- leading edge of blade /
- slot nozzle /
- swirl cooling /
- flow and heat transfer

HTML

图 1 旋流几何结构模型（单位：mm）

Figure 1. Geometrical model of swirl structure （unit: mm）

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图 2 条缝旋流冷却模型网格

Figure 2. Mesh of slot swirl cooling model

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图 3 旋流室XY截面流线图（Re=28510）

Figure 3. Streamline contour at XY section of swirling chamber （Re=28510）

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图 4 旋流室YZ截面流线图和速度云图（Re=28510）

Figure 4. Streamline and velocity contours at YZ section of swirling chamber （Re=28510）

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图 5 旋流室XY截面温度云图（Re=28510）

Figure 5. Temperature contour of swirl chamber at XY section （Re=28510 ）

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图 6 两种旋流结构Nu云图（Re=28510）

Figure 6. Nu contours of two swirling configurations （Re=28510）

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图 7 不同条缝喷嘴宽度条缝喷嘴出口流量分布（Re=28510）

Figure 7. Mass flow distribution of the slot nozzle outlet under different slot nozzle widths （Re=28510）

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图 8 不同条缝喷嘴宽度Nu云图（Re=28510）

Figure 8. Distributions contour of Nu for different slot nozzle widths （Re=28510）

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图 9 不同条缝宽度f随Re变化曲线

Figure 9. Variation curves of friction factor f with the Re for different slot widths

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图 10 不同条缝宽度Nu_a随Re变化曲线

Figure 10. Variation curves of Nu_a with the Re for different slot widths

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图 11 不同条缝宽度j随Re变化曲线

Figure 11. Variation curves of j of different nozzle widths with the Re

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图 12 不同斜度角喷嘴出口处质量流量沿流向分布

Figure 12. Mass flux distribution along the flow direction at the nozzle outlet of different slope angle

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图 13 不同斜度角周向平均努塞尔数沿流向分布

Figure 13. Circumferential averaged Nusselt number distributions of different slope angle along the flow direction

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表 1 不同方案条缝喷嘴几何参数

Table 1. Geometric parameters of slot nozzles for different cases mm

方案	a	b	c	h
1	1.93	1.93	390	200
2	3.85	3.85	390	200
3	5.78	5.78	390	200
4	7.7	7.7	390	200
5	4.4	3.3	390	200
6	4.675	3.025	390	200
7	4.95	2.75	390	200
8	5.5	2.2	390	200
9	3.85	3.85	390	5
10	3.85	3.85	390	15
11	3.85	3.85	390	26
12	3.85	3.85	390	52
13	3.85	3.85	390	104

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表 2 不同Re下流动和传热参数

Table 2. Flow and heat transfer parameters under different Reynolds number

喷嘴	参数	Re
喷嘴	参数	28510	34000	39500	45000	50500
离散喷嘴	Nu_a	270.2	309.3	346.2	380.2	413.7
	f	0.9901	0.9777	0.9667	0.9576	0.9503
	j	1.1175	1.1047	1.0925	1.0764	1.0643
	σ	61.53	66.10	69.50	72.44	74.54
条缝喷嘴	Nu_a	264.5	304.6	341.3	372.1	396.0
	f	1.4320	1.3790	1.3360	1.2910	1.2630
	j	0.9673	0.9700	0.9669	0.9259	0.9266
	σ	17.29	19.55	21.91	22.56	24.01

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表 3 不同斜度角流动和换热参数

Table 3. Flow and heat transfer performance of different slope angle

参数	喷嘴斜度角/rad
参数	0	0.16	0.24	0.32	0.48
Nu_a	264.5	266.2	267.1	267.6	269.1
f	1.432	1.436	1.431	1.431	1.421
j	0.9673	0.9726	0.9770	0.9789	0.9866
σ	17.29	7.31	3.51	3.67	11.53

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表 4 不同高度条缝喷嘴流动和换热参数

Table 4. Flow and heat transfer parameters of slot nozzle under different heights

参数	喷嘴高径比
参数	0.66	1.97	3.41	6.82	13.64	26.23
Nu_a	267.2	264.1	263.5	263.1	263.9	264.5
f	0.7539	0.8012	0.8505	0.9458	1.148	1.4320
j	1.2102	1.1721	1.1464	1.1048	1.0389	0.9673
σ	15.46	13.68	12.29	13.68	15.93	17.29

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