【摘要】 <正> 种子的悬浮速度是反映种子空气动力学特性的一个参数,它对于设计和使用种子风选机,种子气力输送装置等种子机械有很大意义。迄今国内对于树木种子的悬浮速度还未进行过系统的研究。本文在理论分析的基础上,利用实验的方法,对十五种树木种子的悬浮速度,及影响悬浮速度的因素进行了测定和分析。更多还原

【Abstract】 The critical speed of the seeds is a very important technical datum in designing seed fanning mill and pneumatic seed conveyor. Based on the experiment, the effective factors and the speed spreading of the critical speed of the seeds of fifteen kinds of seed, the air selecting effects of different kinds of seed and impurity in the seeds and the choices of the air speed under different conditions have been studied and analyzed in this thesis.The conclusions in the thesis will be useful for the reasonable design and use of the machine related with the critical speed of the seed.更多还原