entropy Article Investigation of the Combined Effect of Variable Inlet Guide Vane Drift, Fouling, and Inlet Air Cooling on Gas Turbine Performance Muhammad Baqir Hashmi , Tamiru Alemu Lemma * and Zainal Ambri Abdul Karim Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Bander Seri Iskandar, 31750 Tronoh, Perak Darul Ridzuan, Malaysia;
[email protected] (M.B.H.);
[email protected] (Z.A.A.K.) * Correspondence:
[email protected]; Tel.: +605-368-7018 Received: 18 October 2019; Accepted: 28 November 2019; Published: 1 December 2019 Abstract: Variable geometry gas turbines are susceptible to various malfunctions and performance deterioration phenomena, such as variable inlet guide vane (VIGV) drift, compressor fouling, and high inlet air temperatures. The present study investigates the combined effect of these performance deterioration phenomena on the health and overall performance of a three-shaft gas turbine engine (GE LM1600). For this purpose, a steady-state simulation model of the turbine was developed using a commercial software named GasTurb 12. In addition, the effect of an inlet air cooling (IAC) technique on the gas turbine performance was examined. The design point results were validated using literature results and data from the manufacturer’s catalog. The gas turbine exhibited significant deterioration in power output and thermal efficiency by 21.09% and 7.92%, respectively, due to the augmented high inlet air temperature and fouling. However, the integration of the inlet air cooling technique helped in improving the power output, thermal efficiency, and surge margin by 29.67%, 7.38%, 32.84%, respectively. Additionally, the specific fuel consumption (SFC) was reduced by 6.88%.