The main points are to represent the utilization ratio of energy as a series of functions of the grain size of feed material and the fineness of discharge al well as the nozzle form.

研究的主要内容是给料粒度与粉碎产物细度和能量效率的关系，以及喷嘴形状与能量效率的关系。

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In this configuration, the HTP is passed over a catalyst pack to decompose it into steam and oxygen, but instead of igniting a fuel grain, this superhot gas is allowed simply to vent through the chamber nozzle.

BBC: Science & Environment