The uniformity of the non-block flow channel was so poor that the block in the proper position of the die channel was necessary.

• 模拟了两端进料式圆柱管无阻尼流道的流动均匀性后得到结论:两端进料式无阻尼结构的流动均匀性较差，宽机头中仍然有必要设置阻尼块;