Experimental Characterization of a Micro Gas Turbine Test Rig

Abstract

For the development of efficient and fuel flexible decentralized power plant concepts a test rig based on the Turbec T100 micro gas turbine is operated at the DLR Institute of Combustion Technology. This paper reports the characterization of the transient operating performance of the micro gas turbine by selected transient maneuvers like start-up, load change and shut-down. The transient maneuvers can be affected by specifying either the electrical power output or the turbine speed. The impact of the two different operation strategies on the behavior of the engine is explained. At selected stationary load points the performance of the gas turbine components is characterized by using the measured thermodynamic and fluid dynamic quantities. In addition the impact of different turbine outlet temperatures on the performance of the gas turbine is worked out. The resulting data set can be used for validation of numerical simulation and as a base for further investigations on micro gas turbines.

Retrofitting micro gas turbines for wet operation. A way to increase operational flexibility in distributed CHP plants

“…Table 2 presents the results for the full load operation of the micro gas turbine in dry and wet mode, the latter being at the maximum steam/air ratio. The data are in accordance to the results presented in the literature [9,15] and small deviations can be attributed to the applied compressor map and the used fuel composition.…”

“…They measured its effectiveness for various flow rates and temperature differences between its streams. Their results were in full agreement to these presented in [9], and showed a relatively weak dependence of the effectiveness on the inlet temperatures and mass flow rates. The results of these works were the main sources of validation for the model of the dry mGT presented in the current paper.…”

“…For both cycles, dry and wet, the compressor is modeled with the same performance map provided from Turbec and validated with data found in literature [9,16]. To simplify the calculations and avoid the use of a turbine performance map, chocked conditions are assumed at its inlet.…”

“…As the gas turbines are assumed to be installed in an electric grid and do not operate in an isolated region, they are modeled on the principle of constant turbine outlet temperature [9]. The value of this temperature is kept constant at 645°C by adjusting the flow rate of the fuel.…”

“…In this context, Hohloch [9] experimented on the steady and transient operation of the Turbec T-100, both for full and part load. They analyzed the behavior of every mGT component and presented the performance map of the compressor and pressure and temperature values at various points of the thermodynamic cycle.…”