Numerical Study of Thermal Behavior of a Wind Turbine Nacelle Operating in a Nordic Climate

Smaïli, Arezki; Masson, Christian; Taleb, Salim Riad; Lamarche, Louis

doi:10.1080/10407780600599547

Cited by 19 publications

(8 citation statements)

References 18 publications

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“…What is more we can find there a comparison of calculated data with results obtained during real engine tests. Smaïli et al (2006, 2012) presented a two-dimensional axisymmetric numerical model for analysis the cooling process of a wind turbine nacelle operating in a cold and in hot climate. In Xie et al (2011) authors compared numerical analysis results regarding to helicopter engine nacelle ventilation system under hover and forward flight conditions with data obtained during real flight tests.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of engine nacelle cooling on pusher configuration aircraft

Olejnik

Dziubiński

Kiszkowiak

2021

AEAT

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Purpose The purpose of this paper is to simulate with in-depth reconstruction of existing geometry a process of cooling of the aircraft engine in pusher configuration, which is more problematic than usually used, tractor configuration. Moreover, a complex thermal and fluid flow analysis is necessary to verify that an adequate cooling is ensured and that temperatures in the engine nacelle are maintained within the operating limits. Design/methodology/approach Methodology used in this research is based on computational fluid dynamics tools to model adequately the internal and the external flow, to find the state of cooling system and research the results of baffles modification inside the engine cover. Additionally, two types of the cover with different sizes of inlets and outlets are tested. Findings The results showed the influence of baffles modifications and changes in inlets and outlet sizes on the mass flow rate and temperature distributions inside the engine nacelle. The best configuration of air inlets and outlets was determined. Practical implications The method used in the research is the safest method in testing of such cases, provided the proper approach in modeling is taken. The collaboration of internal and external flow is crucial and should not be replaced with assumed flow rate through inlet and outlet area. The obtained results will help in future studies on cooling systems of engines in pusher configuration. Originality/value The work presents original results obtained by the authors during a complex fluid flow and heat transmission analysis and is a part of the design project of the OSA patrol aircraft.

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Section: Introductionmentioning

confidence: 99%

CFD simulation of engine nacelle cooling on pusher configuration aircraft

Olejnik

Dziubiński

Kiszkowiak

2021

AEAT

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“…Liu et al investigated pressure distribution on a curved‐shaped ellipsoidal nacelle for nonturbulent and highly turbulent inflow cases and also analyzed the effect of tower on pressure fields. Other studies have focused on accuracy of wind speed measured by nacelle‐mounted anemometer and how that is affected by rotors and atmospheric turbulence (see, eg, Zahle and Sørensen and Masson and Smaïli), or they have investigated the thermal behavior of a wind turbine nacelle, taking into account wind speed, temperature, and the heat released by the electrical generator …”

Section: Introductionmentioning

confidence: 99%

“…Other studies have focused on accuracy of wind speed measured by nacellemounted anemometer and how that is affected by rotors and atmospheric turbulence (see, eg, Zahle and Sørensen 22 and Masson and Smaïli 23 ), or they have investigated the thermal behavior of a wind turbine nacelle, taking into account wind speed, temperature, and the heat released by the electrical generator. 24 The aim of this study is to investigate aerodynamic loads on rectangular and ellipsoidal wind turbine nacelles. The pressure fields on the nacelle surfaces are measured and compared for inflow turbulence of different levels.…”

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confidence: 99%

Aerodynamic loads on wind turbine nacelles under different inflow turbulence conditions

Goit

Ishihara

2019

Wind Energy

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The aerodynamic loads on wind turbine nacelles for range of inflow turbulence conditions are investigated. To this end, a series of wind tunnel experiments are conducted to investigate pressure field distributions over the surface of scaled models of rectangular and ellipsoidal nacelles. It is found that the mean pressure fields on the roof of the rectangular nacelle are similar for all the inflow turbulence cases for respective yaw angles. However, when yaw angle is around 90°, the mean pressure coefficient becomes more negative close to upstream edge with increasing inflow turbulence. For the ellipsoidal nacelle, the magnitude of the mean pressure coefficient increases with decreasing inflow turbulence in the adverse pressure gradient region, although the minimum peak pressure coefficient remains unaffected by inflow turbulence. The overall effect of wind-induced load on the nacelle surfaces is evaluated by computing force coefficients from the pressure data. It is observed that the peak force coefficients for both rectangular and ellipsoidal nacelles increase with increasing inflow turbulence. The models for the estimation of peak aerodynamic loads on the nacelle surfaces are proposed as functions of inflow turbulence and mean force coefficients and show satisfactory agreement with measurements. Finally, the loads calculated by the GL guideline are compared against the measurements. It is found that the guideline estimation is conservative for design load case (DLC) 6.1, but it underestimates the load by about 35% for DLC 6.2 when the inflow turbulence intensity is 13.2%.

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“…Balland et al (2005) studied radiative and convective heat transfer in the nacelle core compartment of an aircraft engine and compared the results obtained with a real engine data. Smaïli et al (2006, 2012) presented a two-dimensional (2D) axisymmetric numerical model of heat transfer and flow both inside and outside the wind turbine nacelle to investigate its thermal behaviour during operation in the cold and extremely hot climate conditions. A three-dimensional (3D) numerical investigations of the engine nacelle ventilation systems of a helicopter were performed by Xie et al (2006, 2011).…”

Section: Introductionmentioning

confidence: 99%

Comparison of 1D and 3D thermal models of the nacelle ventilation system in a small airplane

Łapka

Bakker

Furmański

et al. 2018

AEAT

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Purpose Insight in the temperature distribution on the internal and external surface of the nacelle is of great importance during the design phase of an aircraft. However, detailed information is not always needed. In a preliminary project stage or during parametric optimization, short analysis times are often more crucial than high accuracy. In such cases, the global insight in the temperature levels suffices to gain understanding of the relevance and influence of certain parameters. Nevertheless, estimating the maximum temperature for the most adverse conditions should also be done before a prototype is built. Therefore, this study aims to present and compare a simplified and an advanced methodology for the analysis of engine bay cooling and ventilation systems as well as heat transfer in the nacelle in a small airplane equipped with a turboprop engine in the tractor arrangement. Design/methodology/approach Both approaches included conductive, convective and radiative heat transfer in the engine bay of the small airplane I-23 as well as heat conduction in the nacelle made of material with anisotropic thermal conductivity. The one-dimensional (1D) model assumed that the nacelle with the air flow and engine was represented by a lumped thermal model in which heat was exchanged between the different lumped segments (the nodes) and the flowing air and engine. The three-dimensional (3D) model was based on the continuous control volume approach for heat, fluid flow and thermal radiation as well as on realizable k-ε turbulence model. Both models used commercial software. Findings The temperature distribution at the internal and external surface of the top nacelle was calculated. The 1D model predicted a temperature per node (per segment) while the 3D model was able to determine its values accurately and find the location of hot spots. Considering the complex geometry of the engine bay and nacelle and the assumed simplification, the obtained 1D and 3D results agreed quite well. Practical implications Both models will help in the development of new ventilation and cooling systems of the engine bay and nacelle as well as in the selection of materials for parts of the top cowling in the newly redesigned airplane I-23 equipped with a turboprop engine. In addition, the methodology presented in this paper might be applied in the development of other airplanes. Originality/value The 1D and 3D models of complex heat transfer inside the engine bay and in the nacelle of the newly re-designed airplane I-23 were elaborated and compared.

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Numerical Study of Thermal Behavior of a Wind Turbine Nacelle Operating in a Nordic Climate

Cited by 19 publications

References 18 publications

CFD simulation of engine nacelle cooling on pusher configuration aircraft

CFD simulation of engine nacelle cooling on pusher configuration aircraft

Aerodynamic loads on wind turbine nacelles under different inflow turbulence conditions

Comparison of 1D and 3D thermal models of the nacelle ventilation system in a small airplane

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