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Experiments on a Snow Transportation System with a Jet Pump

喷射泵雪输送系统实验

基本信息

批准号：
01850129
负责人：
YAMAGUCHI Hajime
金额：
$ 0.96万
依托单位：
Nagaoka College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B).
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01850129/
关键词：
Snow Removal Snow Transportation Pipe High Speed Air Flow Jet Pump Compressor Piping by Suction Piping by Compression 三相流二相流輸送管

项目摘要

A method of snow transportation through pipe line will be very useful to dispose or manage snow at narrow space such as in build-up areas and on roof tops where big machines like a snowplow and snow rotary are impossible to operate.Snow will be transported through pipe line with high speed flow of air in the pipe or pressure gradient between the both ends of the pipe.Jet pump operated with water from turbin pump can generate both negative pressure at inlet and positive at outlet comparing with atomosheric pressure.If the pipe line is connected to the inlet, both high speed flow of air and suction force arised from pressure gradient will be caused in the line. In this case, snow can be transported through the line in two-phase flow of snow and air.If the line is connected to the outlet, both high speed flow of water and air and compressive force will be caused in the line. In this case, snow can be transported in three-phase flow, and snow sticks very rarely in the line than the former case.High speed flow of air also can be generated with high pressured air flow from an air compressor. In this case, snow will be transported only by dragging of high speed flow of air in the line, so the faster the speed of the air flow the greater the ability of snow transportation. The distance of snow transportation is very easy to extend by series connecting some units of a compressor and line like this, because of two-phase flow in the line. For this connection, the power of compressors after second unit will be made smaller than the first unit.In any cases mentioned above, more effective methods of throwing snow into these lines should be developed immediately.

管道输雪方法对于建筑物等狭窄空间的积雪处理和管理具有重要意义。在雪犁和旋雪机等大型机器无法操作的地区和屋顶上，雪将通过管道输送，管道中的空气高速流动或管道两端之间的压力梯度。喷射泵与涡轮泵的水一起工作，可以产生两种压力。与大气压相比，入口处为负压，出口处为正压。如果管道连接到入口处，则会在管道中产生高速空气流动和压力梯度引起的吸力。在这种情况下，雪可以以雪和空气的两相流的形式通过管道输送。如果管道连接到出口，则在管道中会产生高速的水和空气流动以及压缩力。在这种情况下，雪可以以三相流的形式输送，与前一种情况相比，雪很少粘在管道中。空气压缩机的高压气流也可以产生高速气流。在这种情况下，雪只会被高速流动的空气在线路中拖曳，所以空气流动的速度越快，雪的输送能力就越大。由于管道内存在两相流，将压缩机的若干单元与这样的管道串联，很容易扩大输雪距离。为此，第二台机组之后的压缩机功率将小于第一台机组。在上述任何情况下，应立即开发更有效的方法将雪抛入这些线路。