Gas Turbine Performance Simulation Using an Optimized Axial Flow Compressor

Abstract

Gas turbines need to operate efficiently due to the high specific fuel consumption. In order to reach the best possible efficiency the main gas turbine components, such as compressor and turbine, need to be optimized. This work reports the use of two specially developed computer programs: AFCC [1, 2] and GTAnalysis [3, 4] for such purpose. An axial flow compressor has been designed, using the AFCC computer program based on the stage-stacking technique. Major compressor design parameters are optimized at design point, searching for best efficiency and surge margin. Operation points are calculated and its characteristics maps are generated. The calculated compressor maps are incorporated to the GTAnalysis computer program for the engine performance calculation. Restrictions, like engine complexity, manufacture difficulties and control problems, are not taken into account.

Transient Behavior in Variable Geometry Industrial Gas Turbines: A Comprehensive Overview of Pertinent Modeling Techniques

“…In practice the VIGV/VSV angles settings are found from rig tests where several kind possible combinations of VSV setting are compared and tested by trial and error method. A comparison of variable geometry schedules from Bringhenti et al [ 70 ], Muir et al [ 137 ], Silva et al [ 69 ], Martins [ 187 ], Gallar et al [ 182 ], Kim et al [ 64 ], Mehr-Homji and Bhargava [ 39 ], Silva et al [ 188 ], Mannarino [ 189 ], Blair and Tapparo [ 190 ], and LaCroix [ 191 ] has been represented in the Figure 16 . This set of VIGV schedules demonstrate that VIGV angle is staggering as a function of shaft speed whereas Gadde et al [ 192 ] proposed another VIGV schedule (see Figure 17 ) in which VIGV angles are staggering as a function power or load setting, hence making it a suitable fit for single shaft IGT that can be employed for power generation applications.…”

“…The trend of VBV schedule is converse of the VIGV schedules as can be observed from illustration. The comparison for variable bleed schedules of Botros et al [ 198 ], Kim et al [ 64 ], Martins [ 187 ] Silva et al [ 69 ], and Bringhenti [ 70 ] has been represented as a function of corrected shaft speed in the Figure 19 . Among these VBV schedules, one can choose the best schedule that might aid in improving the efficiency and surge margin stability.…”

Synergistic Effect of Physical Faults and Variable Inlet Guide Vane Drift on Gas Turbine Engine

“…Since VIGVs and VSVs are scheduled as a function of spool speed, the nominal angle will be adjusted when the engine experiences a speed fluctuation during startup, shutdown, and load changes [17]. Surging and stalling, which frequently occur at low speeds during startup and shutdown, can always be injurious to the engine's health and performance [18]. Therefore, stability is ensured, and performance is improved by removing compressor surge phenomena using the VIGVs and bleed control system.…”

Investigation of the Combined Effect of Variable Inlet Guide Vane Drift, Fouling, and Inlet Air Cooling on Gas Turbine Performance

“…Variable guide vanes (VIGVs and VSVs) are made to function when the engine faces a speed fluctuation during startup, shutdown, and load change since they are scheduled as a function of spool speed [ 3 ]. Often at low speed, during startup and shutdown, the engine may experience surging and stalling that can be harmful to the engine’s overall health and performance [ 4 ]. Hence, the VIGVs and bleed control mechanism ensure stability and improve performance by alleviating surge in the axial compressor.…”