Multi-disciplinary simulation of propeller-turboprop aircraft flight

2012 ◽  
Vol 116 (1184) ◽  
pp. 985-1014 ◽  
Author(s):  
A. Filippone ◽  
Z. Mohamed-Kassim
Keyword(s):  
System Integration ◽  
Flight Mechanics ◽  
Noise Model ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Component Level ◽  
Engine Simulation ◽  
Aircraft Flight ◽  
Turboprop Engine ◽  
Semi Empirical

Abstract This contribution presents a novel simulation for a fixed-wing aircraft powered by gas turbine engines and advanced propellers (turboprops). The work is part of a large framework for the simulation of aircraft flight through a multi-disciplinary approach. Novel numerical methods are presented for flight mechanics, turboprop engine simulation (in direct and inverse mode), and propeller dynamics. We present in detail the integration of the propeller with the airframe, aircraft and tonal noise model. At the basic level, we address a shortfall in multi-disciplinary integration in turboprop-powered aircraft, including economical operations and environmental emissions (exhausts and noise). The models introduced are based on first principles, supplied with semi-empirical correlations, if required. Validation strategies are presented for component-level analysis and system integration. Results are presented for aerodynamics, specific air range, optimal cruise conditions, payload-range performance, and propeller noise. Selected results are shown for the ATR 72-500, powered by PW127M turboprop engines and F568-1 propellers.

scholarly journals Calculation of flow characteristics of liquid fuel supplied through pressure jet atomizers of small-sized gas turbine engines

2021 ◽  
Vol 20 (2) ◽  
pp. 19-35
Author(s):  
N. I. Gurakov ◽  
I. A. Zubrilin ◽  
M. Hernandez Morales ◽  
D. V. Yakushkin ◽  
A. A. Didenko ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Liquid Fuel ◽  
Cone Angle ◽  
Flow Characteristics ◽  
Design Parameters ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Semi Empirical

The paper presents the results of studying the flow characteristics of liquid fuel in pressure jet atomizers of small-sized gas turbine engines with nozzle diameters of 0.4-0.6 mm for various operating and design parameters. The study was carried out using experimental measurements, semi-empirical correlations and CFD (computational fluid dynamics) methods. The Euler approach, the volume- of- fluid (VOF) method, was used to model multiphase flows in CFD simulations. Good agreement was obtained between experimental and predicted data on the fuel coefficient and the primary spray cone angle at the nozzle outlet. Besides, the assessment of the applicability of semi-empirical techniques for the nozzle configurations under consideration is given. In the future, the flow characteristics in question (the nozzle flow rate, the fuel film thickness, and the primary spray cone angle) can be used to determine the mean diameter of the droplets (SMD) required to fully determine the boundary conditions of fuel injection when modeling combustion processes in combustion chambers of small-sized gas turbine engines.

scholarly journals Expert Systems for the Simulation of Gas Turbine Engines

1992 ◽  
Author(s):  
G. Torella
Keyword(s):  
Expert Systems ◽  
Fault Simulation ◽  
Knowledge Bases ◽  
Turbine Engines ◽  
Full Detail ◽  
Gas Turbine Engines ◽  
Control Laws ◽  
Engine Simulation ◽  
Operating Limits ◽  
Set Up

The paper deals with the possibility to develop effective Expert Systems for the simulation, the monitoring and the diagnostics of engines. The work concerns with the development of suitable Knowledge Bases and Expert Systems for different activities. The approach to the problem deals with Expert Systems for engine simulation. These Systems give the operating limits of the engine and the required control laws for reaching assigned values of performance. Other Expert Systems have been developed for fault simulation. The matrices of influence have proved to be suitable for constructing effective Knowledge Bases. Finally Expert Systems for engine diagnostics have been set-up. The paper shows in full detail the methods, the techniques and several applications of the developed codes.

Performance Deterioration Modeling in Aircraft Gas Turbine Engines

1998 ◽  
Vol 120 (2) ◽  
pp. 344-349 ◽  
Author(s):  
A. V. Zaita ◽  
G. Buley ◽  
G. Karlsons
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Operating Time ◽  
Performance Model ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Engine Simulation ◽  
Performance Deterioration ◽  
Data Correlations ◽  
Design Characteristics

Steady-state performance models can be used to evaluate a new engine’s baseline performance. As a gas turbine accumulates operating time in the field, its performance deteriorates due to fouling, erosion, and wear. This paper presents the development of a model for predicting the performance deterioration of aircraft gas turbines. The model accounts for rotating component deterioration based on the aircraft mission profiles and environmental conditions and the engine’s physical and design characteristics. The methodology uses data correlations combined with a stage stacking technique for the compressor and a tip rub model, along with data correlations for the turbine to determine the amount of performance deterioration. The performance deterioration model interfaces with the manufacturer’s baseline engine simulation model in order to create a deteriorated performance model for that engine.

Empirical and Semi-Empirical Correlation of Emissions Data From Modern Turbopropulsion Gas Turbine Engines

1996 ◽  
Author(s):  
Allen M. Danis ◽  
Byron A. Pritchard ◽  
Hukam C. Mongia
Keyword(s):  
Gas Turbine ◽  
Empirical Correlation ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Reactor Modeling ◽  
Annular Combustor ◽  
Unburned Hydrocarbons ◽  
Semi Empirical ◽  
Operating Points ◽  
Unique Relationship

The engine certification emissions data from a CFM56 single-annular combustor (SAC), the CFM56 dual-annular combustor (DAC), the CF6-80C SAC and the CF6-80C SAC low-emissions configuration (LEC) were used to show the following: (1) NOxEI can be correlated as a function of P3 and T3. (2) There is a unique relationship between NOx, CO and unburned hydrocarbons (HC). (3) NOx, CO and HC for engine operating points can be predicted reasonably well through “single reactor” modeling. However, the resulting NOx/CO/HC relationship is not as well predicted indicating need for further improving the semiempirical methodology.

scholarly journals Performance Deterioration Modeling in Aircraft Gas Turbine Engines

1997 ◽  
Author(s):  
Anthony V. Zaita ◽  
Greg Buley ◽  
Glen Karlsons
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Operating Time ◽  
Performance Model ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Engine Simulation ◽  
Performance Deterioration ◽  
Data Correlations ◽  
Design Characteristics

Steady state performance models can be used to evaluate a new engine’s baseline performance. As a gas turbine accumulates operating time in the field, its performance deteriorates due to fouling, erosion and wear. This paper presents the development of a model for predicting the performance deterioration of aircraft gas turbines. The model accounts for rotating component deterioration based on the aircraft mission profiles and environmental conditions, and the engine physical and design characteristics. The methodology uses data correlations combined with a stage stacking technique for the compressor and a tip rub model along with data correlations for the turbine to determine the amount of performance deterioration. The performance deterioration model interfaces with the manufacturer’s baseline engine simulation model in order to create a deteriorated performance model for that engine.

scholarly journals A CASE STUDY OF VIBRATION FAULT DIAGNOSIS APPLIED AT ROLLS-ROYCE T-56 TURBOPROP ENGINE

Aviation ◽  
2020 ◽  
Vol 23 (3) ◽  
pp. 78-82
Author(s):  
Christos Skliros
Keyword(s):  
Fault Diagnosis ◽  
Fault Detection ◽  
Gas Turbine ◽  
Fault Detection And Isolation ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Root Cause ◽  
Significant Challenge ◽  
Turboprop Engine

Gas turbine engines include a plethora of rotating modules, and each module consists of numerous components. A component’s mechanical fault can result in excessive engine vibrations. Identification of the root cause of a vibration fault is a significant challenge for both engine manufacturers and operators. This paper presents a case study of vibration fault detection and isolation applied at a Rolls-Royce T-56 turboprop engine. In this paper, the end-to-end fault diagnosis process from starting system faults to the isolation of the engine’s shaft that caused excessive vibrations is described. This work contributes to enhancing the understanding of turboprop engine behaviour under vibration conditions and highlights the merit of combing information from technical logs, maintenance manuals and engineering judgment in successful fault diagnosis.

scholarly journals A Correlation of Nitrogen Oxides Emissions With Gas Turbine Operating Parameters

1976 ◽  
Author(s):  
G. L. Touchton ◽  
N. R. Dibelius
Keyword(s):  
Nitrogen Oxides ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Functional Form ◽  
Turbine Engines ◽  
Operating Parameters ◽  
Gas Turbine Engines ◽  
Reactor Model ◽  
Semi Empirical ◽  
Humidity Dependence

A semi-empirical correlation between nitrogen oxides emissions and combustor humidity, fuel to air ratio, pressure, and temperature is presented. The functional form of the pressure and humidity dependence is taken from the literature. The functional form of the fuel to air ratio and temperature dependence is deduced from consideration of a well-stirred constant residence time reactor model. The correlation is verified for tests of regenerative and simple-cycle constant speed gas turbines and for sea level tests of three different aircraft gas turbine engines. The residual error is approximately ± 10 percent of the measured emission values over the respective operating ranges. The correlation may be used to correct measured NOx emission levels to standard conditions and to predict emission levels from future designs.

scholarly journals Simulation of CO and CO2 emissions in model combustion chamber based on the combination LES and Reactor Network model

2019 ◽  
Vol 80 ◽  
pp. 03008 ◽  
Author(s):  
S.S. Matveev ◽  
D.V. Idrisov ◽  
N.I. Gurakov ◽  
Gopalakrishna Gangisetty ◽  
I.A. Zubrilin ◽  
...  
Keyword(s):  
Experimental Data ◽  
Air Pollution ◽  
Combustion Chamber ◽  
Initial Conditions ◽  
Environmental Issues ◽  
Turbine Engines ◽  
Emission Sources ◽  
Gas Turbine Engines ◽  
Reactor Network ◽  
Semi Empirical

Air pollution is a major concern of recent decades, which has a serious toxicological impact on human health and the environment. It has a number of different emission sources, but one of the main sources of environmental pollutions is transported systems, in particular aviation gas turbine engines (GTE). Currently environmental issues of GTE are mainly solved by using semi-empirical techniques and experimental refinement of prototypes. In this paper we presented an algorithm for simulating the emission of CO and CO2 in a model combustion chamber under various initial conditions and compared the results, validated with an experimental data.

Gas Screen in Components of Gas Turbine Engines

1997 ◽  
Vol 28 (7-8) ◽  
pp. 536-542
Author(s):  
A. A. Khalatov ◽  
I. S. Varganov
Keyword(s):  
Gas Turbine ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Gas Screen
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