The compliance verification of thermodynamic flowfield in the large icing wind tunnel
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摘要: 大型结冰风洞热流场符合性是大型结冰风洞适航应用的前提条件。为验证中国空气动力研究与发展中心3 m×2 m结冰风洞热流场符合性，建立了结冰风洞热流场符合性验证方法；针对主试验段构型，开展了热流场符合性验证试验，考察了试验段气流总温、试验段气流速度和喷嘴干空气射流对热流场空间均匀性和时间稳定性的影响，获得了试验段气流总温修正关系，形成了3 m×2 m结冰风洞主试验段热流场控制包线。结果表明：基于目前制冷系统性能，降低气流总温和提高气流速度会减弱试验段热流场空间均匀性，但对气流总温时间稳定性并无显著影响；喷嘴干空气射流会提高试验段气流总温，但对试验段模型区内热流场品质并无显著影响；在主要试验条件下，3 m×2 m结冰风洞热流场品质基本满足SAE ARP 5905-2003要求。Abstract: The compliance of thermodynamic flowfield in the large icing wind tunnel is the precondition for the airworthiness application of the large icing wind tunnel. In order to verify the compliance of the thermodynamic flowfield in the CARDC icing wind tunnel, a verification method is established firstly, and then a verification test is conducted for the main test section. The influences of the test section total temperature, velocity and the nozzle dry air jet flow on the spatial uniformity and temporal stability of thermodynamic flowfield are examined, and the correction relationship of the test section total temperature is obtained. Finally, the thermodynamic flowfield operating envelop is built. Results show that decreased test section total temperature and increased test section velocity could reduce the spatial uniformity of the thermodynamic flowfield in the test section for the actual refrigeration system of the CARDC icing wind tunnel, but have no obvious effects on the temporal stability of the thermodynamic flowfield. The nozzle dry air jet flow could increase the test section total temperature, while it has no significant influence on the spatial uniformity and temporal stability of the thermodynamic flowfield. The quality of the thermodynamic flowfield of the CARDC icing wind tunnel in the main test section almost meets the requirement of SAE ARP 5905-2003 under the main test condition.
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图 2 结冰风洞总温探针安装位置示意图
Figure 2. The position of total temperature probes mounted in the CARDC icing wind tunnel
图 3 结冰风洞热流场符合性验证方法流程图
Figure 3. The flow diagram of the compliance verification method of thermodynamic flowfield of the icing wind tunnel
图 5 温度格栅测点位置矩阵
Figure 5. Measurement point position matrix of the temperature grid device
图 6 试验段气流总温空间分布云图
Figure 6. Spatial distribution of the total temperature in the test section
图 7 试验段模型区气流总温空间偏差标准差和最大绝对值
Figure 7. The standard deviation and maximum absolute value of the spatial deviation of airflow total temperature in the model area of the test section
图 8 试验段中心线处气流总温时间偏差变化曲线
Figure 8. Profiles of the time deviation of the airflow total temperature in the centerline of the test section
图 9 试验段中心线处气流总温时间偏差标准差和最大绝对值
Figure 9. The standard deviation and maximum absolute value of the time deviation airflow total temperature in the centerline of test section
图 10 试验段中心线处气流总温修正关系和不确定度
Figure 10. The correction relationship and uncertainty of the airflow total temperature in the centerline of the test section
图 11 试验段中心线处气流总温与风洞测量总温之差
Figure 11. The difference between the total temperature in the centerline of the test section and the wind tunnel total temperature
图 12 3 m×2 m结冰风洞主试验段热流场控制包线
Figure 12. The thermodynamic flowfield operating envelop of CARDC icing wind tunnel in the main test section
表 1 试验段尺寸参数
Table 1. The test section size parameters
Test section Dimension Height/m Width/m Length/m Maintest section 2 3 6.5 Secondarytest section 3.2 4.8 9.0 High speed test section 1.5 2 4.5 
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表 2 结冰风洞热流场品质指标
Table 2. The quality index of thermodynamic flowfield of icing wind tunnel
Items Static air temperature Ts < －30 ℃ －30 ℃ < Ts < 5 ℃ Measurement instrumentation
maximum uncertainty±2.0 ℃ ±0.5 ℃ Spatial uniformity ±2.0 ℃ ±1.0 ℃ Temporal stability ±2.0 ℃ ±0.5 ℃
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表 3 温度场校测工况
Table 3. Test conditions of airflow total temperature measurement
Parameter Value Tt/ ℃ －30, －20, －15, －10, －5, 0, 5 vTS/(m·s-1) 40, 80, 120, 140 pa/MPa 0.03, 0.40, 0.90 Ta/ ℃ 80
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