Rotary Regenerators for the Whirlfire Vehicular Turbines

1959 ◽  
Author(s):  
Paul T. Vickers
Keyword(s):  
Heat Exchanger ◽  
Gas Turbine ◽  
Pressure Loss ◽  
Gas Turbine Engine ◽  
General Motors ◽  
Design And Development ◽  
Turbine Engine ◽  
Performance Results

The major considerations in the selection, design and development of a rotary regenerator for a vehicular gas turbine are discussed. The performance results, such as effectiveness, pressure loss and leakage of the regenerator in the General Motors Research GT-305 gas-turbine engine are presented in detail. A method for evaluating new heat-exchanger surfaces and the techniques used in developing the regenerator are also included.

scholarly journals The effect of heat recovery on the optimal values of helicopter turboshaft engine parameters

2020 ◽  
Vol 19 (4) ◽  
pp. 43-57
Author(s):  
H. H. Omar ◽  
V. S. Kuz'michev ◽  
A. O. Zagrebelnyi ◽  
V. A. Grigoriev
Keyword(s):  
Heat Exchanger ◽  
Gas Turbine ◽  
Heat Recovery ◽  
Thermodynamic Cycle ◽  
Gas Turbine Engine ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Working Process ◽  
Turbine Engine ◽  
Recuperative Heat Exchanger

Recent studies related to fuel economy in air transport conducted in our country and abroad show that the use of recuperative heat exchangers in aviation gas turbine engines can significantly, by up to 20...30%, reduce fuel consumption. Until recently, the use of cycles with heat recovery in aircraft gas turbine engines was restrained by a significant increase in the mass of the power plant due to the installation of a heat exchanger. Currently, there is a technological opportunity to create compact, light, high-efficiency heat exchangers for use on aircraft without compromising their performance. An important target in the design of engines with heat recovery is to select the parameters of the working process that provide maximum efficiency of the aircraft system. The article focused on setting of the optimization problem and the choice of rational parameters of the thermodynamic cycle parameters of a gas turbine engine with a recuperative heat exchanger. On the basis of the developed method of multi-criteria optimization the optimization of thermodynamic cycle parameters of a helicopter gas turbine engine with a ANSAT recuperative heat exchanger was carried out by means of numerical simulations according to such criteria as the total weight of the engine and fuel required for the flight, the specific fuel consumption of the aircraft for a ton- kilometer of the payload. The results of the optimization are presented in the article. The calculation of engine efficiency indicators was carried out on the basis of modeling the flight cycle of the helicopter, taking into account its aerodynamic characteristics. The developed mathematical model for calculating the mass of a compact heat exchanger, designed to solve optimization problems at the stage of conceptual design of the engine and simulation of the transport helicopter flight cycle is presented. The developed methods and models are implemented in the ASTRA program. It is shown that optimal parameters of the working process of a gas turbine engine with a free turbine and a recuperative heat exchanger depend significantly on the heat exchanger effectiveness. The possibility of increasing the efficiency of the engine due to heat regeneration is also shown.

Regenerator Development for the British Leyland 2S/350/R Gas Turbine Engine

1974 ◽  
Author(s):  
J. A. Ritchie ◽  
P. A. Phillips ◽  
M. C. S. Barnard
Keyword(s):  
Heat Exchanger ◽  
Gas Turbine ◽  
Gas Turbine Engine ◽  
Turbine Engine ◽  
Single Disk

This paper describes the application of the ceramic regenerator to the British Leyland truck gas turbine. Aspects of mounting, driving and sealing the heat exchanger disk are covered with particular reference to the single disk version of the 2S/350/R engine.

Fabrication and Performance of a Pin Fin Micro Heat Exchanger

2004 ◽  
Vol 126 (3) ◽  
pp. 434-444 ◽  
Author(s):  
Christophe Marques ◽  
Kevin W. Kelly
Keyword(s):  
Heat Exchanger ◽  
Gas Turbine ◽  
Heat Exchangers ◽  
Turbine Blades ◽  
High Heat ◽  
Gas Turbine Engine ◽  
High Heat Flux ◽  
Turbine Engine ◽  
Pin Fin ◽  
Micro Heat Exchanger

Nickel micro pin fin heat exchangers can be electroplated directly onto planar or non-planar metal surfaces using a derivative of the LIGA micromachining process. These heat exchangers offer the potential to more effectively control the temperature of surfaces in high heat flux applications. Of particular interest is the temperature control of gas turbine engine components. The components in the gas turbine engine that require efficient, improved cooling schemes include the gas turbine blades, the stator vanes, the turbine disk, and the combustor liner. Efficient heating of component surfaces may also be required (i.e., surfaces near the compressor inlet to prevent deicing). In all cases, correlations providing the Nusselt number and the friction factor are needed for such micro pin fin heat exchangers. Heat transfer and pressure loss experimental results are reported for a flat parallel plate pin fin micro heat exchanger with a staggered pin fin array, with height-to-diameter ratios of 1.0, with spacing-to-diameter ratios of 2.5 and for Reynolds numbers (based on the hydraulic diameter of the channel) from 4000 to 20,000. The results are compared to studies of larger scale, but geometrically similar, pin fin heat exchangers. To motivate further research, an analytic model is described which uses the empirical results from the pin fin heat exchanger experiments to predict a cooling effectiveness exceeding 0.82 in a gas turbine blade cooling application. As a final point, the feasibility of fabricating a relatively complex micro heat exchanger on a simple airfoil (a cylinder) is demonstrated.

Lube Oil and Bearing Thermal Management System

2009 ◽  
Author(s):  
Karleine M. Justice ◽  
Jeffrey S. Dalton ◽  
Ian Halliwell ◽  
Stephen Williamson
Keyword(s):  
Heat Exchanger ◽  
Gas Turbine ◽  
Thermal Management ◽  
Gas Turbine Engine ◽  
System Level ◽  
Engine Oil ◽  
Management Systems ◽  
Lubrication System ◽  
Turbine Engine ◽  
Heat Loads

Recent improvements in technology have enabled the development of models capable of capturing performance interactions in the thermal management of air vehicle systems. Such system level models are required for better understanding of integration constraints and interactions, and are becoming increasingly important because of the need for tighter coupling between the components of thermal management systems. The study described here integrates current engine modeling capabilities with an improved, more comprehensive thermal management simulation. More specifically, the current effort evaluates the heat loads associated with the lubrication system of a gas turbine engine. The underlying engine model represents a mid-size, two-spool, subsonic transport engine. The architecture of the model is adaptable to other two-spool turbine engines and missions. Mobil Avrex S Turbo 256 engine oil is used as the lubrication medium. The model consists of five bearing heat loads. Within the engine flowpath, local temperatures and the appropriate rotational speeds are the only parameters pertinent to the heat load calculations. General assumptions have been made to simplify the representation of the lubrication system. Fuel properties into the heat exchanger are assumed. A gear box attached to the high-speed shaft operates both supply pump and scavenge pump and sends compressed air to the oil reservoir. Once the oil is distributed to the bearings, the scavenge pump collects and sends it through a filter and a fuel/oil heat exchanger before it is remixed with the contents of the reservoir. A MATLAB/Simulink modeling environment provides a general approach that may be applied to the thermal management of any engine. As a result of this approach, the new model serves as a starting point for a flexible architecture that can be modified as more detailed specifications or data are made available. In this paper, results from the simple model are compared to a more comprehensive tribology-based analysis. The results demonstrate its successful application to a typical mission, based on very limited data. In general, these results will allow system designers to conduct preliminary analyses and trade studies of gas turbine engine thermal management systems.

Design of a Carbon-Carbon Finned Surface Heat Exchanger for a High-Bypass Ratio, High Speed Gas Turbine Engine

2006 ◽  
Author(s):  
Tom Filburn ◽  
Amanda Kloter ◽  
Dave Cloud
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Gas Turbine ◽  
Gas Turbine Engine ◽  
Carbon Composites ◽  
Numerical Estimation ◽  
Turbine Engine ◽  
Conductive Materials ◽  
Final Design ◽  
Finned Surface

Compact heat exchanger designs are commonly used in many gas turbine engine applications. Though effective in their heat transfer function, they are often heavy, costly, and poor aerodynamic performers causing a reduction in engine efficiency. In addition, they are complex to manufacture and often prone to leakage. Finned surface heat exchangers are an attractive alternative to traditional compact designs. They can perform efficiently both aerodynamically and thermally. Such units could be mounted in the bypass fan stream of a gas turbine engine where large amounts of heat must be rejected from vital engine fluids such as oil and fuel. This research project investigated the efficiency of various fin designs applied to an oil cooler. Highly conductive materials, such as carbon composites were explored, and then compared to aerospace-quality aluminum alloys. Thermal, aerodynamic, economic, and weight performance comparisons between the carbon and aluminum fin structures were quantified. A three-dimensional numerical estimation of the final design concept was conducted using ANSYS. This research project specifically investigated the design of a finned surface air-oil heat exchanger. Design parameters included a total heat rejection of 2000 Btu/min and an oil temperature change of 100 degrees Fahrenheit with an inlet oil temperature of 300 degrees. The first design phase was conducted using an aerospace quality aluminum alloy. Internal and external flow convection theory was studied closely as well as basic heat exchanger and fin design concepts. A heat exchanger program was developed in Excel, automating the heat transfer based on basic geometric inputs. The program allowed easy iterations of fin/oil passage designs to meet the performance requirements and optimize the heat exchanger’s weight. The final iteration was then numerically modeled in ANSYS. The predicted heat transfer rate was then compared to the numerical estimation in ANSYS. The Excel program was validated by producing results within 2% of the ANSYS predicted solutions. Upon completion of the aluminum design. highly conductive materials, such as carbon composites were explored and implemented. The final designs of this project (both Aluminum and Carbon-Carbon) identified a new method of heat rejection at a significantly lower weight impact to the engine. The aluminum design had a total core weight of 25.4 lb while the carbon-carbon final design had a total core weight of 12.8 lb. In addition, both units have the potential to be incorporated within an existing engine case exposed to the bypass air stream, which may result in an additional weight savings.

scholarly journals Development of a Ceramic Heat Exchanger for a Closed-Cycle Gas Turbine Engine

1979 ◽  
Author(s):  
M. G. Coombs
Keyword(s):  
Heat Exchanger ◽  
Power Systems ◽  
Gas Turbine ◽  
Gas Turbine Engine ◽  
Small Scale ◽  
Closed Cycle ◽  
Fabrication Technology ◽  
Turbine Engine ◽  
Heat Exchanger Design ◽  
Ceramic Components

This paper describes the development of a silicon carbide heat exchanger for the CCPS-40-1 closed-cycle gas turbine engine. This effort was part of a program to explore the use of closed-cycle power systems for utilities. The program consists of heat exchanger design, the development of a design approach for large ceramic components, the establishment of a material data base, and the development of the required fabrication technology. Small-scale ceramic heat exchangers were operated at material temperatures up to 2300 F.

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