Investigation of the influence of the speed and direction of the oil jet on the efficiency of the oil scoop operation in the oil supply system to the bearings of the gas turbine engine

Fuel supply system, the regulation system for fuel delivery to the combustor, is one of the most important auxiliary systems in a gas turbine engine. Commonly, the fuel supply system was always simplified as a linear system. In fact, gas turbine engines almost use a hydromechanical main fuel control system which consists of electro-hydraulic servo actuator and fuel metering unit. These components have several nonlinear characteristics such as hysteresis, dead zone, relay, and saturator. These nonlinear characteristics can directly affect the performance a gas turbine engine. In this paper, a three-shaft gas turbine engine was taken as a research object. Firstly, a mechanism model of the fuel control system considering the nonlinear links was developed based on the hydro-mechanical theory. Then, the effect of dead zone-relay characteristic of the servo amplifier in electro-hydraulic servo actuator was analyzed. The results show that the dead zone width has great effect on the dynamic performance of the gas turbine engine. The fuel flow rate will be oscillating with small dead zone width. The parameters of the gas turbine engine will be stable with the increase of dead zone width. However, the larger dead zone width causes the hysteresis and the increase of the dynamic response time. At the same time, an improvement method with a two-dimensional fuzzy compensation was proposed. The results show that the fuzzy compensation can effectively solve the oscillation problem caused by the dead zone-delay. Finally, a Hardware-In-the-Loop (HIL) system is developed which is based on an electro-hydraulic servo actuator facility and a real-time software component of the gas turbine engine. An experiment is conducted on the HIL test rig to validate simulation result. The results show that the experiment matches well with the simulation results.

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Testing of gas turbine engine bearing oil supply through an oil-catch ring

VESTNIK of the Samara State Aerospace University ◽

10.18287/2412-7329-2015-14-3-2-460-466 ◽

2015 ◽

Vol 14 (3-2) ◽

pp. 460

Author(s):

A. A. Boev ◽

A. G. Petrukhin ◽

A. A. Mikhailov

Keyword(s):

Gas Turbine ◽

Gas Turbine Engine ◽

Turbine Engine ◽

Oil Supply ◽

Engine Bearing

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Testing of gas turbine engine bearing oil supply through an oil-catch ring

VESTNIK of the Samara State Aerospace University ◽

10.18287/2412-7329-2015-14-3-460-466 ◽

2015 ◽

Vol 14 (3-2) ◽

pp. 460

Author(s):

A. A. Boev ◽

A. G. Petrukhin ◽

A. A. Mikhailov

Keyword(s):

Gas Turbine ◽

Gas Turbine Engine ◽

Turbine Engine ◽

Oil Supply ◽

Engine Bearing

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Simulation of an oil supply through the oil catching ring to the gas turbine engine bearings

Aviation Engines ◽

10.54349/26586061_2020_2_27 ◽

2020 ◽

pp. 27-34

Author(s):

S.V. Falaleev ◽

A.A. Boev

Keyword(s):

Gas Turbine ◽

Gas Turbine Engine ◽

Turbine Engine ◽

Oil Supply

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Electrically Driven On Demand Oil System for Gas Turbine Engines

Volume 4: Ceramics; Concentrating Solar Power Plants; Controls, Diagnostics and Instrumentation; Education; Electric Power; Fans and Blowers ◽

10.1115/gt2013-94706 ◽

2013 ◽

Author(s):

Christopher J. Spytek

Keyword(s):

System Design ◽

Gas Turbine ◽

Gas Turbine Engine ◽

Turbine Engines ◽

Prototype System ◽

Gas Turbine Engines ◽

Turbine Engine ◽

Oil Supply ◽

Filter Performance ◽

On Demand

An on demand oil system, based on electrically driven lube and scavenge pumps, for use in gas turbine engines has been developed. The need to optimize gas turbine engine performance, coupled with ‘electrification’ of aircraft systems, as on the Lockheed F35 and Boeing 787 in order to maximize efficiency and flexibility, created an opportunity to develop a ‘smart’ electrically driven lubrication system for gas turbine engines. Spytek’s electric oil system, developed for use on its 400lbt ATG-2 engine platform, ascertains the operating condition of the gas turbine engine, including speed, pressure, bearing temperatures and determines the amount of lubrication required for each bearing zone. The system has the benefit of better thermal control of engine bearings, lower system weight and power use, with flexibility in the placement of the system on the engine/airframe combination. The system has been successfully demonstrated on the Spytek Aerospace ATG-2/J304 gas turbine engine series. Major areas addressed in the development of the system were the selection of reliable, gas turbine engine compatible feed and scavenge pumps, control systems sensoring and feedback, variable feed of oil to the individual sump wells, as well as systems durability and operating parameters. Various gas turbine engine platforms can require altered oil system duty cycles, including pre-oiling or post run down-oiling, high flow oil conditions, features not readily available in traditional mechanical systems but easily implemented using the Spytek on-demand oil system. In the project effort, evaluation of the existing prototype system was used as a system design baseline. Data on pump wear, filter performance and oil supply degradation was available and used in refining the oil system design. The ATG-2 system was modified to take advantage of a full proportional integral derivative controlled oil system with system demonstrations made on a gas turbine engine, demonstrating oil supply on demand capability and full bearing thermal management system control.

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