Application of Carbon Nanotubes and Temperature Sensitive Paint for the Detection of Boundary Layer Transition under Cryogenic Conditions (Invited)
Application of Carbon Nanotubes and Temperature Sensitive Paint for the Detection of Boundary Layer Transition under Cryogenic Conditions (Invited)
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碳纳米管和温敏涂料在低温条件下边界层转变检测中的应用（特邀）
DOI：
10.2514/6.2017-0336
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
J. Quest
中科院分区：
文献类型：
--
作者：
C. Klein;U. Henne;Daisuke Yorita;U. Beifuss;V. Ondruš;A. Hensch;R. Longo;M. Hauser;P. Guntermann;J. Quest
在飞行器模型的气动剖面试验中，转捩检测是一个非常重要的问题。下
红外技术（IR）是一种成熟的基于图像的方法
目的.在低温下进行的高雷诺数试验中，
技术的适用性有限。基于图像的温度敏感涂料（TSP）
技术非常适合这些条件。用TSP探测边界层转捩
通常需要在模型表面和流动之间的人工温差。用于风力
在低温条件下运行的隧道，这种温差可以通过改变
工作流体的液氮注入速率导致流动温度的快速变化。
这种方法的缺点是，在流动温度变化的过程中，
马赫数也不能保持恒定。为了解决这个问题，我们最近出版了一份
碳纳米管（CNT）用于电加热模型表面的替代方法
从而产生明确的温度差以使层流-湍流转变可视化。的
CNT和TSP的组合，我们称之为cntTSP，在不同的风洞中提供了良好的结果
从室温到150 K的测试。在较低的温度下，先前使用的CNT层不能工作，
由于纳米管被嵌入到已知不适合于
低温在本文中，我们描述了一种新的传感器开发，其基于以下想法：所有
将涂料组分混合（CNT）或溶解（TSP）在聚氨酯粘合剂材料中，所述聚氨酯粘合剂材料具有
在以前的测试中证明了其适用于低温测试。在预测试CNT和TSP之后，
实验室，低温风洞实验进行了试验设施的欧洲
跨音速风洞（PETW），目的是在二维风洞中显示层流-湍流转捩。
雷诺数模型
c S 10 × 106·比较两种方法的结果，
工质标准温度阶跃法及基于该模型的新方法
将介绍和讨论通过CNT的表面加热。
For aerodynamic profile tests on aircraft models, transition detection is of great interest. Under
ambient flow conditions the infrared technique (IR) is a well-established image-based method for this
purpose. In high Reynolds number tests which are conducted at cryogenic temperatures the IR
technique is of only limited suitability. In contrast, the image-based Temperature-Sensitive Paint (TSP)
technique is well-suited for these conditions. Boundary layer transition detection by means of TSP
generally requires an artificial temperature difference between model surface and flow. For wind
tunnels operated under cryogenic conditions this temperature difference can be generated by changing
the liquid nitrogen injection rate of the working fluid causing a rapid change of the flow temperature.
The drawback of this procedure is that du ring the change of the flow temperature neither the Reynolds
nor the Mach number can be kept constant. To overcome this problem, we have recently published an
alternative approach where Carbon Nanotubes (CNT) are used to electrically heat the model surface
and thus generate a well-defined temperature difference to visualize laminar-turbulent transition. The
combination of CNT and TSP, which we call cntTSP, delivered excellent results in different wind tunnel
tests from ambient down to 150 K. At lower temperatures the previously used CNT layer failed to work,
since the nanotubes were embedded into an acrylic binder material which is known to be unsuitable for
cryogenic temperatures. In this paper we describe a new sensor development based on the idea that all
paint components are mixed (CNT) or dissolved (TSP) in a polyurethane binder material, which has
demonstrated its suitability for cryogenic testing in previous tests. After pre-testlng CNT and TSP in the
laboratory, a cryogenic wind tunnel experiment was conducted in the pilot facility of the European
Transonic Windtunnel (PETW) with the aim to visualize the laminar-turbulent transition on a twodimensional
model for Reynolds number Re
c S 10xl06• A comparison between the results of the
standard temperature-step method of the working fluid and of the new approach based on the model
surface heating by means of CNT will be presented and discussed.
影响因子：
64.8
作者：
IIJIMA, S
通讯作者：
IIJIMA, S