Chapter 7.2 TurboShaft Engine v1 PDF
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School of Mechanical & Aeronautical Engineering
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This document presents an overview of a turboshaft engine, focusing on its components and applications. It explores the working principles, features, and specifications of the lycoming T-53 turboshaft engine.
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Chapter 7.2: TurboShaft Engine Introduction Introduction On Turbo-shaft Engines Lycoming T-53 Turboshaft Engine 2 Introduction On Turbo-shaft Engines Deliver shaft horse-power, which may be used in helicopter to rotate the blades. APU uses turboshaft...
Chapter 7.2: TurboShaft Engine Introduction Introduction On Turbo-shaft Engines Lycoming T-53 Turboshaft Engine 2 Introduction On Turbo-shaft Engines Deliver shaft horse-power, which may be used in helicopter to rotate the blades. APU uses turboshaft engine to provide electrical power and pneumatic power. Turbine engine that delivers torque through shaft is known as turbo-shaft engine. There are marine and other industrial application for turbo-shaft engines. 3 Introduction On Turbo-shaft Engines Turboshaft is also used as an APU on modern aircraft to provide independent source of pneumatic and electrical power. The other is its use as a propulsive unit in helicopter. A free turbine means that the power turbines are not mechanically coupled to or limited by the speed of the compressor drive turbines. Approximately 2/3 of the gas energy passing through the first stage turbine rotor is used to drive the compressor rotor assembly; the rest is used by the second-stage turbine to drive the power shaft. 4 Turbo-shaft Engines Purpose: Extract shaft power to drive a vehicle or electrical power production. Features: Gear reduction or direct drive. High power output per unit mass. More efficient than an “automotive” type engine. Used for powering ships, trains, cars, tanks, helicopters, gas pipelines, and industrial power plants. 5 Turbo-shaft Engines 6 Chapter 10: TurboShaft Engine Curvic Coupling Assembly The coupling shaft as shown is to Teeth connect Free Turbine shaft to Power Output shaft for helicopter. Power is transferred to the Power Output shaft to the Main Gear Box for turning the main rotor blades and tail rotor blades. Curvic-coupling *Turbomeca Training notes 7 Curvic-Coupling Assembly 8 UH-1H 9 Lycoming T-53 Turboshaft Engine The Lycoming T-53 is installed in the Grumman OV-1 and several models of the Bell UH-1 and 204 helicopter. The engine is a free-turbine power plant. The engine described here is a single-stage, free power turbine driven turboshaft engine with a single-stage gas- producer turbine that drives a combination axial- centrifugal compressor. Five major sections of the engine are air inlet, compressor, diffuser, combustor, and exhaust. 10 Lycoming T-53 Turboshaft Engine Specifications Number of compressor stages: 5 axial, 1 centrifugal Number of turbine stages: 2 or 4 Number of combustors: 1 Maximum power at sea level: 1100 to 1400 shp Specific fuel consumption at maximum power: 0.58 to 0.68 Compression ratio at maximum rpm: 6:1 Maximum diameter: 23 in. Maximum length: 47 in. approx. Maximum dry weight: 500 Ib approx 11 Lycoming T-53 Turboshaft Engine 12 Lycoming T-53 Engine Airflow 13 Recap Measuring unit of turboshaft engine power output Explain about working principle of curvic-coupling assembly The common uses of Turboshaft engine on aviation platform 14
