Answer Posted / chinmay kumar patra(npti)
In case of high pressure turbine specific volume is less so less space is required.Singe pass design is satisfactory so no need of reduce the size by double pass designing.High pressure is maintained at outlet by using 1 or 2 impulse stage at starting stage so after reheating it must be able to reach up to last stage fr high work done.So high pressure at O/L of HP turbine is needy.So single pass design.
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