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Detectable Problems
Published in Tony Giampaolo, Gas Turbine Handbook: Principles and Practice, 2020
Acceleration problems, either a lack or too much of, usually result from governor malfunctions (although the malfunctions may not be specifically with the governor mechanism). These malfunctions may result from faulty governor input signals such as speed, compressor discharge pressure, temperature, or fuel flow. Overspeed could be the result of a governor malfunction, electrical upsets (generator drives), or coupling failure. Overspeed is detrimental not only to the gas turbine but also to the driven load. Redundant systems (usually two electrical and one mechanical) are installed to protect against overspeed. The electrical systems should be checked periodically (simulation test) and the mechanical fly-bolt should be cleaned. It is not possible to check the operation of the mechanical fly-bolt mechanism in the field.
Detectable Problems
Published in Tony Giampaolo, Gas Turbine Handbook Second Edition, 2002
Acceleration problems, either a lack or too much of, usually result from governor malfunctions (although the malfunctions may not be specifically with the governor mechanism). These malfunctions may result from faulty governor input signals such as speed, compressor discharge pressure, temperature, or fuel flow. Overspeed could be the result of a governor malfunction, electrical upsets (generator drives), or coupling failure. Overspeed is detrimental not only to the gas turbine but also to the driven load. Redundant systems (usually two electrical and one mechanical) are installed to protect against overspeed. The electrical systems should be checked periodically (simulation test) and the mechanical fly-bolt should be cleaned. It is not possible to check the operation of the mechanical fly-bolt mechanism in the field.
Optimization of diesel engine dual-variable geometry turbocharger regulated two-stage turbocharging system based on radial basis function neural network-quantum genetic algorithm
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2021
Guangmeng Zhou, Ruilin Liu, Zhongjie Zhang, Chunhao Yang, Haojian Ding
This paper optimizes the blade openings of HVGT and LVGT under variable altitude and variable speed conditions to make the RTST system in the best working state, thereby improving the power and economy of diesel engines under high-altitude conditions. The optimization object is a diesel engine running at full load under variable altitude conditions, and the optimization goal is power and economy of diesel engine. The blade openings of HVGT and LVGT are selected as the turbocharging system parameters, the speed and altitude are used as the operating parameters of the diesel engine, and the torque is selected to characterize the power performance of the diesel engine. Due to the low air density in the plateau, there are problems such as deterioration of combustion, increased thermal load, and overtemperature and overspeed of the supercharger during diesel engine operation. Therefore, the in-cylinder combustion pressure is introduced to evaluate the combustion status in the cylinder, and the turbine exhaust temperature is introduced to evaluate the diesel engine thermal load. A certain number of training samples are needed to establish the nonlinear mapping relation of parameters by using neural network. Considering the limited experimental data, the GT-power simulation model is used to carry out DOE experiment to obtain the sample data needed for neural network learning. The DOE experiment adopts the LHS algorithm. As a constrained sampling method, after determining the number of tests, LHS will divide the interval into non-overlapping sub-intervals according to the number of tests, and then conduct independent equal probability sampling on each sub-interval (Hu, Shi, and Sun et al. 2015).