Subjects: Materials Science >> Materials Science (General) Subjects: Energy Science >> Energy Science (General) submitted time 2016-11-15 Cooperative journals: 《金属学报》
Abstract:基于同时满足连铸水模拟实验中Re和Fr相似要求,建立了一套可全尺度模拟连铸过程流动的实验平台。利用该平台的NI图像处理与PIV粒子测速技术,对特厚板连铸用中间包内速度场、涡量场、RTD等流动特征进行研究。结果表明,中间包内流动呈现湍流漩涡状,在注流区形成一个类似“漏斗”状的涡结构,由于中间包内通道的存在,在浇注区形成两个大的环流,并对侧墙有明显冲击,非接触测量获取的RTD与数值模拟结果吻合,长的停留时间和大的死区体积表明该中间包补热的必要性。
Subjects: Geosciences >> Space Physics submitted time 2016-05-04
Abstract: In the noncoherent Doppler wind lidar system, the laser line width and frequency stability are two important factors influencing the accuracy of measurement results. The injection seeding technique method was used to obtain narrow linewidth of 532 nm lidar. The iodine filters as receiv frequency discriminators and lock the transmitter laser frequency. Using VB language writing instrument control program based on PID algorithm, the frequency of seed laser locked in iodine molecular absorption lines, which was 1109 line of high reflection on the edge. The frequency stability was better then �.5 MHz for 4 h, the long-term frequency stability as 3.55�0-9. Design the continuous light velocity measuring system, which concluded the cure about Doppler frequency shift and actual speed of chopped wave plate, the velocity error was less than 0.4 m/s. This also shows that the laser velocity measuring system can be calibrated on the lock the frequency of the whole system. This experiment also provides guidance significance for the construction of wind lidar. � 2015, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.
Peer Review Status:Awaiting Review
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-05-24 Cooperative journals: 《工程热物理学报》
Abstract:本文对采用等离子体激励控制滤清器惯性级中的气流分离进行了试验研究。采用粒子成像测速技术(PIV)测量3种不同位置处等离子体激励下的惯性级大分离位置处的速度流场。试验结果表明:等离子体激励产生的诱导气流对流场注入能量,能够增大出口气流的纵向分速。激励的效果与激励位置有关,激励位置越靠近气流分离点,激励效果越明显,出口气流纵向分速越大。因此,选取合适的等离子体激励器贴附位置,可以提高等离子体激励对惯性级中总压损失的控制效果。