Dieter Warnack

Testing the Latest Model V84.3A Gas Turbine in the Siemens Test Facility in Berlin

Since the end of 1998, the new V84.3A has been under investigation in the Siemens Gas Turbine Development and Manufacturing Center in Berlin. Especially for the testing of gas turbine prototypes, Siemens runs a test bed which allows full load tests with speed variations. Hence the engine can be tested at the extremes of real gas turbine operation conditions.Within the range of the investigations there have been combustion optimization and performance tests at full and part load. A focus was the testing of various kinds of water injection. Additionally blade vibration measurements in the turbine and the compressor, surface temperature measurements using thermal paint and pyrometry, and aerodynamics measurements using five-hole probes have been performed.Copyright

Simulation of Non-Steady and Non-Linear Flow Phenomena in Complex Piping Systems of Gas Turbines

In order to get information on how pressure fluctuations in the combustion chamber of a gas turbine act on the gas piping system and adapters for measurement of pressure fluctuations, a one-dimensional, compressible, unsteady, anisentropic code is applied. This is done to obtain more detailed information about particular flow phenomena like wave propagation, superposition and the influence of heat transfer and damping. The model used was formed by using the one-dimensional equation laws of mass, momentum and energy to a hyperbolic differential equation system. This system was solved numerically by using the well proven PROMO code originating from the automotive industry as described in detail by Gorg [1]. The existing model was extended and adapted to be applicable to the problems described above.Copyright

An Optimized Pneumatic Probe for Investigation of Gas Turbine Aerodynamics in Full Scale Gas Turbines

In this paper an optimized probe based on in house experience and literature studies for use in full scale gas turbines for power generation is presented. The main advantages of its design are the insensitivity of the probe head to unsteady wakes of blades, its high strength and suitability for high temperatures. Furthermore it is shown that the calibration function is unambiguous. The second part of the paper deals with correction methods for comparison to numerical methods such as difference in position, mass flow, bending of the probe and blockage effects. The methods are discussed by means of examples.© 2002 ASME

Component Tests With a Model V84.3A Gas Turbine in the Siemens Test Facility in Berlin

In its Gas Turbine Development and Manufacturing Center in Berlin Siemens runs a test bed for gas turbine prototypes. Since the end of 1998, the new model V84.3A gas turbine has been undergoing tests at this facility. One focus of last year’s tests was on flow field measurements with pneumatic probes in the exit flow duct of the turbine at various load levels to characterize the flow in the diffuser and provide a data base. Another item was the further investigation of the compressor surge margin and the validation of a newly-developed on-line surge prediction system.Copyright