Small Grants for Exploratory Research: Rapid Heat Transfer Coefficient Measurement in a Computer Integrated Manufacturing Environment

用于探索性研究的小额资助：计算机集成制造环境中的快速传热系数测量

• 批准号: 9014814
• 负责人: John Eaton
• 金额: $ 3.17万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-01 至 1991-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9014814&HistoricalAwards=false
• 关键词: Small; Grants; Exploratory; Research; Rapid

Determination of heat transfer coefficients for manufactured objects subjected to a flow field is an important engineering consideration for stress analysis and useful life prediction. A new measurement technique to obtain pointwise heat transfer coefficients over complex geometric objects is proposed. The method represents an alternative procedure to the traditional and time-consuming experimental technique which uses distributed heaters and temperature transducers implanted in a design prototype of a manufactured object to set and measure the thermal field at the surface of the object. The new method has the potential to provide rapid determination of the heat transfer to, and temperature distribution on engineering devices, subjected to various flow regimes without the need for expensive and time-consuming instrumentation of the devices. It is proposed as an integral step in a Computer Integrated Manufacturing scheme based on Computer-Aided-Design (CAD) of prototype engineering stems. The new method involves existing measurement tools and/or technology (CAD, multiple-event liquid crystals, a robotically controlled hot-air jet for the application of surface temperatures, and numerical thermal regime modeling), and these tools are applied iteratively to obtain the heat transfer coefficients. In sequence: 1) a prototype engineering object is designed and manufactured via CAD; 2) the object is coated with liquid crystals so that optical measurements of surface temperature may be obtained; 3) the object is "painted" with a prescribed temperature distribution using the robotically-controlled hot jet; 4) the object is subjected to a flow field; 5) the new surface temperature distribution is determined optically; 6) a numerical model is used to calculate the surface temperatures using an estimated (best guess) distribution for the surface heat transfer coefficients; 7) if the numerical model predicts the same temperature distribution as that measured, then the estimated heat transfer distribution is correct. If not, the sequence returns to step 3, and finally, after several iterations, the correct distribution of heat transfer coefficients over the object is obtained.

人造板传热系数的测定 流场作用下的物体是一项重要的工程 考虑应力分析和使用寿命预测。 一种新的逐点传热测量技术 系数的复杂几何对象。 的 方法是传统方法的替代方法， 耗时的实验技术， 分布式加热器和温度传感器植入 制造对象的设计原型，以设置和测量 物体表面的热场。 新 方法具有快速测定 工程上的传热与温度分布 设备，经受各种流态，而不需要 对于昂贵和耗时的仪器， 装置. 它被提议作为计算机中的一个整体步骤 基于计算机辅助设计的集成制造方案 (CAD)原型工程茎。 新方法涉及现有的测量工具和/或 技术（CAD，多事件液晶，机器人 用于表面涂覆的受控热空气射流 温度和数值热状态建模），以及 这些工具被反复应用以获得热量 传递系数 按顺序：1）原型 通过CAD设计和制造工程对象; 2） 该物体涂有液晶 可以获得表面温度的测量值; 3） 物体被“涂上”规定的温度分布 使用机器人控制的热射流; 4）物体被 5）新表面温度 光学确定分布; 6）数值模型， 用来计算地表温度， (best表面传热的分布 （7）如果数值模型预测相同， 温度分布的测量，然后估计 传热分布正确。 如果不是，则序列 返回到步骤3，最后，经过几次迭代， 传热系数的正确分布 目标已获得。