高弗劳德数下绕锥头回转体通气空泡流态特征及压力脉动特性实验研究

李涵; 郝亮; 张孟杰; 刘涛涛; 孔德才

doi:10.11729/syltlx20230138

高弗劳德数下绕锥头回转体通气空泡流态特征及压力脉动特性实验研究

doi: 10.11729/syltlx20230138

李涵^1,,
郝亮¹,
张孟杰³,
刘涛涛^{1, 2, ,},
孔德才⁴

1.
北京理工大学机械与车辆学院, 北京　100081
2.
北京理工大学重庆创新中心, 重庆　401120
3.
中国北方车辆研究所, 北京　100072
4.
北京宇航系统工程研究所, 北京　100076

基金项目: 国家自然科学基金项目(12002038，U22B6010，52109111，U20B2004)

详细信息

作者简介:
李涵：（1999—），女，河北邯郸人，硕士研究生。研究方向：通气空泡流态特征及非定常特性。E-mail：lh184358@163.com

通讯作者:
E-mail：liutaotao@bit.edu.cn

中图分类号: O359
计量
- 文章访问数: 46
- HTML全文浏览量: 19
- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2023-10-25
- 修回日期: 2024-01-11
- 录用日期: 2024-01-16
- 网络出版日期: 2024-03-20

Experimental study on the flow pattern and pressure fluctuation characteristics of ventilated cavitating flows around a conical axisymmetric body at high Froude number

LI Han^1
,,
HAO Liang¹,
ZHANG Mengjie³,
LIU Taotao^{1, 2
, ,},
KONG Decai⁴

1.
School of Mechanical Engineering, Beijing Institute of Technology, Beijing　100081, China
2.
Chongqing Innovation Center, Beijing Institute of Technology, Chongqing　401120, China
3.
China North Vehicle Research Institute, Beijing　100072, China
4.
Beijing Institute of Astronautical System Engineering, Beijing 10076, China

摘要

摘要: 本文基于循环水洞，采用高速摄影和压力传感器对绕锥头回转体通气空泡的流场特性进行了测量，重点讨论了高弗劳德数下通气空泡的流态特征以及不同空泡形态下回转体壁面的压力演化规律。研究结果表明：高弗劳德数下，重力效应可以忽略，绕锥头回转体通气空泡呈现出泡沫状(FC)、间歇透明状(ITC)和连续透明状(CTC)等三种典型的流态。其中，FC状空泡位于小通气率范围内，空泡末端以小尺度空泡团脱落为主，回转体壁面瞬态压力分布呈现出高频、低幅值脉动，压力系数最大脉动幅值为0.18；ITC状空泡为FC和CTC之间的过渡流态，空泡末端的大尺度空泡团脱落使得回转体壁面瞬态压力分布呈现出低频、高幅值脉动，压力系数最大脉动幅值为0.49；CTC状空泡位于大通气率范围内，空泡脱落以及压力脉动特性与ITC状空泡类似。特定的弗劳德数下，由FC逐渐转变为CTC的过程中，不同测点获得的回转体壁面压力都呈现出先减小后增大并稳定的趋势。
- 高弗劳德数 /
- 通气空泡 /
- 流态特征 /
- 压力脉动
Abstract: This paper is based on a circulating water tunnel, employing high-speed photography and pressure sensors to measure the flow characteristics of the ventilated cavity around a conical axisymmetric body. The focus of the discussion is on the flow characteristics of ventilated cavities at high Froude numbers and the pressure evolution on the axisymmetric body surface for different cavity shapes. The research results indicate that under high Froude numbers, gravity effects can be neglected, and ventilated cavities around the conical axisymmetric body exhibit three typical flow patterns: Foamy cavity (FC), Intermittent and Transparent cavity (ITC), and Continuous and Transparent cavity (CTC). Among these, FC cavities are found within a small ventilation rate range, accompanied by some small-scale cavity shedding at cavity’s trailing. The transient pressure distribution on the axisymmetric body surface exhibits high-frequency, low-amplitude fluctuations, with the maximum pressure coefficient fluctuation amplitude of 0.18. ITC cavities represent a transitional flow pattern between FC and CTC, characterized by the shedding of large-scale cavity clusters from the cavity’s trailing, resulting in low-frequency, high-amplitude fluctuations in the transient pressure distribution on the axisymmetric body surface, with a maximum pressure coefficient fluctuation amplitude of 0.49. CTC cavities are observed within a large ventilation rate range, exhibiting similar characteristics in cavity shedding and pressure pulsation to ITC cavities. Under specific Froude numbers, during the transition from FC to CTC, the pressure on the axisymmetric body surface at different measurement points exhibits a trend of initially decreasing, then increasing, and finally stabilizing.
- high Froude number /
- ventilated cavity /
- flow pattern /
- pressure fluctuation

HTML全文

图 1 空泡水筒实验示意图

Figure 1. Schematic diagram of cavitation water tunnel experiment

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图 2 回转体模型示意图

Figure 2. The size of axisymmetric body .

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图 3 FC的实验观测图及示意图（Fr=9.58，C_Q=0.004，σ_v=5.45）

Figure 3. Experimental observation and schematic illustration of the foamy cavity （FC） at Fr=9.58 , C_Q=0.004 and σ_v=5.45.

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图 4 ITC的实验观测图及示意图（Fr=9.58，C_Q=0.034，σ_v=5.47）

Figure 4. Experimental observation and schematic illustration of the intermittent and transitional cavity （ITC） at Fr=9.58, C_Q=0.034 and σ_v=5.47.

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图 5 CTC的实验观测图及示意图（Fr=9.58，C_Q=0.082，σ_v=5.47）

Figure 5. Experimental observation and schematic illustration of the continuous and transparent cavity （CTC） at Fr=9.58 , C_Q=0.082 and σ_v=5.47.

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图 6 回转体通气空泡流态图谱

Figure 6. Globe flow patterns of ventilated cavities around an axisymmetric body.

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图 7 Fr=9.58时不同通气率下的时均空泡外形（σ_v=5.47）

Figure 7. Time-averaged cavity shapes at different ventilation rates at Fr=9.58 and σ_v=5.47.

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图 8 不同通气率下的压力系数

Figure 8. The pressure coefficient at different ventilation rates

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图 9 不同通气率下的空化数

Figure 9. The cavitation number at different ventilation rates

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图 10 两种流态下空泡长度随时间的变化（FC: Fr=9.58， C_Q=0.004; ITC: Fr=9.58, C_Q=0.034）

Figure 10. The change of cavity length with time in two flow patterns（FC: Fr=9.58， C_Q=0.004; ITC: Fr=9.58, C_Q=0.034）

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图 11 FC空泡的发展演化过程与压力系数（Fr=9.58，C_Q=0.004）

Figure 11. Evolution process and pressure coefficient of FC cavity （Fr=9.58，C_Q=0.004）

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图 12 ITC空泡的发展演化过程与压力系数（Fr=9.58，C_Q=0.034）

Figure 12. Evolution process and pressure coefficient of ITC cavity （Fr=9.58，C_Q=0.034）

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表 1 不同通气率下的空化数

Table 1. The number of cavitation at different ventilation rates

C_Q	P1	P2	P3	P4	P5	P6	P7
0.017	0.116	/	/	/	/	/	/
0.034	0.257	0.243	0.204	0.161	0.059	/	/
0.040	0.253	0.240	0.210	0.213	0.124	0.027	/
0.058	0.189	0.179	0.149	0.222	0.174	0.184	0.180
0.067	0.159	0.149	0.119	0.189	0.149	0.159	0.160
0.078	0.157	0.146	0.118	0.187	0.143	0.154	0.154
0.092	0.154	0.143	0.111	0.177	0.143	0.153	0.155
0.111	0.153	0.141	0.111	0.169	0.140	0.150	0.150

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