Turbine Cooling

1959 ◽  
Vol 81 (3) ◽  
pp. 226-233 ◽  
Author(s):  
Jack B. Esgar
Keyword(s):  
Gas Turbine ◽  
Fuel Consumption ◽  
Power Output ◽  
Specific Fuel Consumption ◽  
Specific Power ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Turbine Cooling ◽  
Specific Power Output ◽  
Engine Type

Turbine cooling, originally developed because of a shortage of heat-resistant alloys, is of interest for certain applications to permit operation of gas-turbine engines above uncooled temperatures. Specific power output would be increased, and in some cases specific fuel consumption decreased, depending on the engine type. Progress is reported on developments since 1952.

The Feasibility of Heat Pipe Turbine Vane Cooling

1994 ◽  
Author(s):  
Calvin C. Silverstein ◽  
Joseph M. Gottschlich ◽  
Matthew Meininger
Keyword(s):  
Heat Pipe ◽  
Gas Turbine ◽  
Fuel Consumption ◽  
Heat Sink ◽  
Specific Fuel Consumption ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Engine Thrust ◽  
Turbine Vanes ◽  
Turbine Vane

This paper evaluates the basic feasibility and anticipated benefits to using heat pipe technology to cool the turbine vanes of gas turbine engines. This concept involves fitting out the vane interior as a heat pipe, extending the vane into an adjacent heat sink and then transferring the vane incident heat through the vane to the heat sink. The baseline is an advanced military fighter engine and the bypass air is the chosen heat sink. The results of this study show a 7.2% increase in engine thrust, a 0.2% decrease in specific fuel consumption with engine weight increased by less than 1% by using this technology.

scholarly journals Mathematical model for calculating the mass of a heat exchanger in problems of optimizing the parameters of the working process of aircraft gas turbine engines

2019 ◽  
Vol 18 (3) ◽  
pp. 67-80
Author(s):  
V. S. Kuz'michev ◽  
H. Omar ◽  
A. Yu. Tkachenko ◽  
A. A. Bobrik
Keyword(s):  
Mathematical Model ◽  
Heat Exchanger ◽  
Gas Turbine ◽  
Fuel Consumption ◽  
Heat Recovery ◽  
Specific Weight ◽  
Specific Fuel Consumption ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Turbine Engine

Despite the fact that aviation gas turbine engines (GTE) have reached a high degree of sophistication, requirements for the improvement of their efficiency are constantly increasing. Reduction of specific fuel consumption and specific weight of the engine unit makes it possible to improve aircraft performance. One of the effective means of reducing specific fuel consumption and obtaining high thermal efficiency of a gas turbine engine is the use of heat recovery, so the interest in it holds throughout the period of development of gas turbine engines. However, the use of heat recovery in aircraft gas turbine engines is faced with a contradiction: on the one hand, heat recovery allows reducing specific fuel consumption, but, on the other hand, it increases the weight of the power plant due to the presence of a heat exchanger. Moreover, with the increase in the degree of regeneration, specific fuel consumption decreases, whereas the mass of the power plant increases.To obtain the desired effect, it is necessary to optimize simultaneously both the parameters of the engine work process and the degree of regeneration of the heat exchanger according to the criteria of evaluating the engine unit in the aircraft system. For this purpose, it is necessary to have a mathematical model for estimating the weight of a highly efficient aircraft heat exchanger. The article presents a developed mathematical model for calculating the weight of a compact plate heat exchanger used to increase the efficiency of a gas turbine engine due to the heating of compressed air entering the combustion chamber by the hot gas that enters the combustion chamber from behind the turbine. We chose a rational pattern of relative motion of the working media in the heat exchanger, the optimal type of plate-type heat transfer surface in terms of minimizing the weight of the heat exchanger and the hydraulic losses in the air and gas ducts. For the selected surface type, the dependence of the specific weight of the heat exchanger on the degree of regeneration is determined for different nozzle exhaust velocities on the basis of a computational algorithm. To assess the reliability of the obtained model, comparative analysis of the effect of the degree of regeneration on the specific weight of the heat exchanger was carried out, based on the comparison of the results of calculations for the developed model with the data of other authors and with the data for the produced regenerators.

Thermodynamic Performance of Complex Gas Turbine Cycles

2002 ◽  
Author(s):  
Sanjay ◽  
Onkar Singh ◽  
B. N. Prasad
Keyword(s):  
Gas Turbine ◽  
Specific Power ◽  
Turbine Engines ◽  
Inlet Temperature ◽  
Air Cooling ◽  
Gas Turbine Engines ◽  
Current State ◽  
Thermodynamic Performance ◽  
Internal Convection ◽  
Plant Efficiency

This paper deals with the thermodynamic performance of complex gas turbine cycles involving inter-cooling, re-heating and regeneration. The performance has been evaluated based on the mathematical modeling of various elements of gas turbine for the real situation. The fuel selected happens to be natural gas and the internal convection / film / transpiration air cooling of turbine bladings have been assumed. The analysis has been applied to the current state-of-the-art gas turbine technology and cycle parameters in four classes: Large industrial, Medium industrial, Aero-derivative and Small industrial. The results conform with the performance of actual gas turbine engines. It has been observed that the plant efficiency is higher at lower inter-cooling (surface), reheating and regeneration yields much higher efficiency and specific power as compared to simple cycle. There exists an optimum overall compression ratio and turbine inlet temperature in all types of complex configuration. The advanced turbine blade materials and coating withstand high blade temperature, yields higher efficiency as compared to lower blade temperature materials.

scholarly journals Inlet Air Fogging of Marine Gas Turbine in Power Output Loss Compensation

2015 ◽  
Vol 22 (4) ◽  
pp. 53-58 ◽  
Author(s):  
Zygfryd Domachowski ◽  
Marek Dzida
Keyword(s):  
Gas Turbine ◽  
Power Output ◽  
Gas Turbines ◽  
Evaporative Cooling ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Output Loss ◽  
Direct Evaporative Cooling ◽  
Loss Compensation ◽  
The World

Abstract The use of inlet air fogging installation to boost the power for gas turbine engines is widely applied in the power generation sector. The application of fogging to mechanical drive is rarely considered in literature [1]. This paper will cover some considerations relating to its application for gas turbines in ship drive. There is an important evaporative cooling potential throughout the world, when the dynamic data is evaluated, based on an analysis of coincident wet and dry bulb information. This data will allow ships’ gas turbine operators to make an assessment of the economics of evaporative fogging. The paper represents an introduction to the methodology and data analysis to derive the direct evaporative cooling potential to be used in marine gas turbine power output loss compensation.

scholarly journals The Potential of the Gas-Turbine Vehicle in Alleviating Air Pollution

1970 ◽  
Author(s):  
Edward S. Wright
Keyword(s):  
Air Pollution ◽  
Gas Turbine ◽  
Power Output ◽  
Environmental Concern ◽  
Turbine Engines ◽  
Manufacturing Cost ◽  
Gas Turbine Engines ◽  
Vehicle Performance ◽  
Reciprocating Engines ◽  
Engine Power

The author examines the potential of the gas turbine in alleviating air pollution as a replacement for presently used vehicular reciprocating engines. Automobiles receive particular emphasis because of the magnitude of their contribution to the problem. Emissions of gas-turbine engines are compared with those of gasoline reciprocating engines, and other important characteristics relevant to the problem (such as engine power output, reliability, transmissions, vehicle performance, fuel consumption, and manufacturing cost) are discussed. It is concluded that widespread adoption of vehicular gas-turbine engines can — provided these engines can be produced and operated at costs competitive with those of future reciprocating engines — can virtually eliminate automotive air pollution as a source of serious environmental concern.

Power Output of Small Gas-Turbine Engines

2022 ◽  
Author(s):  
Kaitlyn Brendlinger ◽  
Nicholas D. Grannan ◽  
Adam T. Holley ◽  
Kavi Muraleetharan
Keyword(s):  
Gas Turbine ◽  
Power Output ◽  
Turbine Engines ◽  
Gas Turbine Engines

Ship Gas Turbine Engine With the Intermediate Gas Reheating Before the Power Overexpansion Turbine

2012 ◽  
Author(s):  
O. Andriets ◽  
V. Matviienko ◽  
V. Ocheretianyi
Keyword(s):  
Power Plant ◽  
Gas Turbine ◽  
Specific Power ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Turbine Engine ◽  
Exhaust Gases ◽  
Power Turbine ◽  
Operating Regimes ◽  
Additional Fuel

Gas-turbine engines (GTE) posses a number of technical merits and they are widely used in the structure of ship propulsion complexes. However, if GTE is used as a ship cruise engine it is necessary to increase efficiency with the goal to be competitive to diesels. Increasing of the simple cycle GTE efficiency is possible due to the overexpansion turbine employment, where the internal energy of exhaust gases is used. That allows to obtain, deducting energy expenses on exhaust gases pressing, the additional useful work without the additional fuel expenses. Power overexpansion turbine employment leads to raising of power plant heaviness, that’s why it is desirable to increase engine power when its weight is constant. Insertion of the intermediate gas reheating before power turbine in the thermal scheme of GTE with the power overexpansion turbine considerably increases GTE’s specific power. GTE with the intermediate gas reheating before the power overexpansion turbine have greater specific power and they are more economic than simple cycle’s GTE on a large spectrum of ship’s power plant operating regimes. GTE with intermediate gas reheating before the power overexpansion turbine have stable efficiency on operating regimes, that’s why it is preferable to employ them for hydrofoil ships.

scholarly journals Wave-Rotor-Enhanced Gas Turbine Engines

1997 ◽  
Vol 119 (2) ◽  
pp. 469-477 ◽  
Author(s):  
G. E. Welch ◽  
S. M. Jones ◽  
D. E. Paxson
Keyword(s):  
Gas Turbine ◽  
Fuel Consumption ◽  
Engine Performance ◽  
Specific Fuel Consumption ◽  
Specific Power ◽  
Inlet Temperature ◽  
Wave Rotor ◽  
Performance Levels ◽  
Turbine Engine ◽  
The Impact

The benefits of wave rotor topping in small (300- to 500-kW [400- to 700-hp] class) and intermediate (2000- to 3000-kw [3000- to 4000-hp] class) turboshaft engines, and large (350- to 450-kN [80,000- to 100,000-lbf] class) high-bypass-ratio turbofan engines are evaluated. Wave rotor performance levels are calculated using a one-dimensional design/analysis code. Baseline and wave-rotor-enhanced engine performance levels are obtained from a cycle deck in which the wave rotor is represented as a burner with pressure gain. Wave rotor topping is shown to enhance the specific fuel consumption and specific power of small- and intermediate-sized turboshaft engines significantly. The specific fuel consumption of the wave-rotor-enhanced large turbofan engine can be reduced while it operates at a significantly reduced turbine inlet temperature. The wave-rotor-enhanced engine is shown to behave off-design like a conventional engine. Discussion concerning the impact of the wave rotor/gas turbine engine integration identifies technical challenges.

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