What is turbine isentropic efficiency?

η_t = w_actual/w_isentropic = (h_1 − h_2)/(h_1 − h_2s). Typical values: gas turbines 85–92%, steam turbines 85–90%. Lower efficiency means more entropy generation and waste heat.

What is degree of reaction in turbines?

Degree of reaction = static enthalpy drop across rotor / total stage enthalpy drop. 50% reaction (50% expansion in stator, 50% in rotor) gives symmetrical velocity triangles and is common in axial turbines.

How does pressure ratio affect turbine output?

Higher pressure ratio increases temperature drop and specific work. However, turbine inlet temperature limits the pressure ratio due to material constraints in blades and disks.

Turbine Specific Work Calculator

Calculate turbine specific work w = c_p(T_1 − T_2). Find isentropic exit temperature T_2s = T_1(P_2/P_1)^((γ−1)/γ). Apply isentropic efficiency: w_actual = η_turbine × w_isentropic.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)

σy — Normal Stress Y (MPa)

τxy — Shear Stress (MPa)

⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.

How to Use

Enter the values for the patient or scenario you are assessing. Calculate turbine specific work w = c_p(T_1 − T_2). Find isentropic exit temperature T_2s = T_1(P_2/P_1)^((γ−1)/γ). Apply isentropic efficiency: w_actual = η_turbine × w_isentropic. Use the turbine work result to inform your clinical assessment.

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Frequently Asked Questions

What is turbine isentropic efficiency?

What is degree of reaction in turbines?

How does pressure ratio affect turbine output?