气幕减阻对模型船体起步阻力影响的分析

Effect of Air Screen to Start Resistance of Model Hull in Boat Type Tractor

试验研究表明,由于湿软土壤与船体钢板间的粘附作用,船式拖拉机静止船体的起步阻力随船体停置时间的延长而增大,其值可达正常滑行阻力的五六倍以上。为了降低起步阻力,在试验室内对模型船体进行了气幕减阻试验。结果表明,利用气幕效应可使静置船体的起步阻力降低20～25％。

The experimental study shown that the start resistance of hull for boat type trac-tor increases sharply with parking time in the soil bin upto five times of the normal slipping onebecause of vicous friction beteewn wet soil and hull. For reducing the start resistance, furthertests were carried in lab with the model hull by blowing pressured air from the hull bottom to thesoil surface to form a air screen. As a result, the start resistance of the hull adopting air screentechnique has been cowered twenty-five percent against the common one.