核磁共振测速技术及其在涡轮叶片内部通道中的应用  

Magnetic resonance velocimetry and applications ininternal channels of turbine blades

作　　者：陈若雨 段敬添 王子瑞 张科 武俊梅 雷蒋 范青 CHEN Ruoyu;DUAN Jingtian;WANG Zirui;ZHANG Ke;WU Junmei;LEI Jiang;FAN Qing(State Key Laboratory for Strength and Vibration of Mechanical Structures,School of Aerospace Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Xi'an Aerospace Propulsion Institute,Xi'an 710100,China)

机构地区：[1]西安交通大学航天航空学院复杂服役环境重大装备结构强度与寿命全国重点实验室,陕西西安710049 [2]西安航天动力研究所,陕西西安710100

出　　处：《火箭推进》2024年第6期143-153,共11页Journal of Rocket Propulsion

基　　金：国家自然科学基金(52076167)。

摘　　要：核磁共振测速技术(magnetic resonance velocimetry,MRV)利用原子核的电磁特性,通过解析原子核在梯度磁场作用下拉莫尔进动的相位差,获得速度分布。与光学速度测量技术相比,MRV无粒子入侵,不受光学条件的限制,可以快速测量复杂结构通道内全空间三维速度场。利用MRV测量涡轮叶片内部多流程通道的速度分布,结合多流程通道传热分布特点,分析带肋多流程通道内三维流场特性与影响传热强化的特征流动结构,探索流动传热的耦合机理。结果表明,MRV能以高分辨率精确解析多流程通道内复杂的三维流动特征及其沿流程演变;弯道处流动具有复杂的三维特征,存在显著的二次流动;肋片引起的二次流动冲击下端壁,是当地传热强化的主要原因。Magnetic resonance velocimetry(MRV)is based on the electromagnetic characteristics of the nucleus.It can obtain the velocity distribution by analyzing the phase difference of the Larmor precession under the gradient magnetic field.Compared with optical measurement techniques,MRV can rapidly obtain the 3D flow field in a space with complicated geometry.By MRV,the spatial distribution of the 3D velocity in the multi-pass channel was measured.Combined with the heat transfer distribution characteristics of multi-pass channels,the characteristics of the flow field and the flow structures affecting heat transfer enhancement in the ribbed channel were analyzed.The coupling mechanism of flow heat transfer was explored.Results indicate that MRV has the capability to accurately resolve the complex 3D flow in a multi-pass channel.The flow field near the bend has complex three-dimensional characteristics.The secondary flow is obvious on the cross-sections near the bends of the multi-pass channel.The main reason for local heat transfer enhancement is the impingement toward the endwall which is driven by the secondary flow induced by the rib turbulator.

关 键 词：核磁共振成像测速 三维流场测量 多流程肋化通道 二次流动 流动传热 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]