权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

DEVELOPMENT OF VELOCIMETRY

测速技术的发展

基本信息

批准号：
10211201
负责人：
IGUCHI Manabu
金额：
$ 29.5万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10211201/
关键词：
VELOCIMETRY MOLTEN METAL MOLTEN STEEL CONTINUOUS CASTING LORENTZ FORCE WAVE MOTION SWIRL CURRENT LEVEL SENSOR 電磁力ホール素子連続鋳造

项目摘要

There are two methods of electro-magnetically measuring the velocity of molten metal flow based on the fluctuation components. One processes the fluctuation components originally exist in the molten metal flow. The detail of the measurement method should be referred to a previous paper by Julius et al. The other processes the fluctuation components artificially imposed on the flow. This method is considered here. The measurement principle can be explained as follows :Wave motions are imposed on the surface of molten metal flowing in a vessel by using an alternating magnetic field. A transmitting coil is used to generate the magnetic field. The frequency of the wave motions is predetermined. The waves propagates both in the upstream and downstream directions. The wave motions can be detected by two receiving coils (level sensors) placed at upstream and downstream positions. The distance from the transmitting coil to the upstream sensor is the same as that from the transmitting coil to t … More he downstream sensor. There appears a time delay between the output signals of the two sensors. The time delay depends on the velocity of molten metal flow. Accordingly, the velocity of the molten metal flow can be determined from the time delay and the coil distance provided that the propagation speed of the wave motions is given. Fortunately, the propagation speed can be readily detected by some methods. It was 70cm/s under the present experimental conditions.The effects of the transmitting frequency, the coil distance, the distance from the molten metal surface to the coil (coil height) on the accuracy of this method was examined using an Wood's metal bath. A swirl current type level sensor was used as a receiving coil. The measurement was accurately carried out for a transmitting frequency of 100kHz, current of 10A, a coil height of 2 mm, a coil distance of 100mm, and a wave frequency of 0.8 Hz. The maximum velocity was 60 cm/s. It should be noted that the molten metal velocity higher than 70 cm/s cannot be measured with this method because the wave propagation velocity is 70cm/s under the present experimental conditions. This result suggests that the measurement of the molten steel flow velocity in the continuous casting mold is possible by this method. Less

基于波动分量的电磁法测量金属熔体流动速度有两种方法。一种是处理原来存在于熔体流动中的波动成分。测量方法的细节应参考Julius等人以前的一篇论文。另一种是处理人为施加在流量上的波动分量。这里考虑的是这种方法。其测量原理可解释为：利用交变磁场对容器内流动的金属熔体表面施加波动。发射线圈用来产生磁场。波动的频率是预先确定的。波在上游和下游两个方向上传播。通过放置在上游和下游位置的两个接收线圈(液位传感器)可以检测到波动。传输线圈到上游传感器的距离与传输线圈到t…的距离相同更多的是下游传感器。两个传感器的输出信号之间存在时间延迟。时间延迟取决于熔体的流动速度。因此，只要给定波动的传播速度，就可以根据时间延迟和线圈距离来确定熔体流动的速度。幸运的是，传播速度可以通过一些方法很容易地检测到。在本实验条件下为70 cm/S，利用Wood‘s金属熔池考察了发射频率、线圈间距、金属液面到线圈的距离(线圈高度)对该方法测量精度的影响。采用涡流型液位传感器作为接收线圈。在发射频率为100 kHz，电流为10A，线圈高度为2 mm，线圈间距为100 mm，波频为0.8 Hz的情况下，进行了精确的测量。需要注意的是，在目前的实验条件下，由于波传播速度为70 cm/S，因此不能用该方法测量高于70 cm/S的熔体速度。这一结果表明，用该方法测量连铸结晶器内钢水流动速度是可能的。较少