保护壳体具有下部件和帽类型的上部件，所述下部件具有至少一个被合适成形的凹部，以将配料单元保持在稳定位置。
The protective housing has a lower part with at least one suitably shaped cavity for holding the metering unit (s) in a stable position and a cap-type upper part.
半球壳体轴向下部设有连通圆缺凹腔的吸收腔。
The axial lower section of the hemisphere case is equipped with the absorption cavity which connects with the segmental concave cavity.
燃烧室的最高壁温出现在凹腔前壁面下部或凹腔上壁面中部；
The hot spot temperature of combustor appeared in the lower of fore-wall or in the middle of upper-wall.
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