Volumetric efficiency of a reciprocating air compressor is given by [Where, C = clearance or clearance ratio, \(\frac{{{p_2}}}{{{p_1}}}\) = Pressure ratio , n = Index of expansion = Index of compression]
1
\(1 + C + C{\left[ {\frac{{{p_2}}}{{{p_1}}}} \right]^{1/n}}\)
2
\(1 + C -{\left[ {\frac{{{p_2}}}{{{p_1}}}} \right]^{1/n}}\)
3
\(1 + C - C{\left[ {\frac{{{p_2}}}{{{p_1}}}} \right]^{1/n}}\)
4
\(1 + C + C{\left[ {\frac{{{p_1}}}{{{p_2}}}} \right]^{1/n}}\)
5
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