These normally exceed sonic velocity with the consequence that the loom are noisy and consume considerable amount of energy. This increases the cost of weaving and tends to make air jet looms less attractive.

• 通常使用的气流速度超过声速,其结果是织机噪声的提高和能耗的增加。织造成本的提高使喷气织机有被忽视的倾向。