... = relative velocity α = heat transfer coefficient α = angle of attack β = angle of attack in rotating coordinate system ΔT = temperature difference η TP = polytropic efficiency λ = thermal conductivity ρ = density τ = timescale ϕ = flow...

... uncertainty analysis of the two-step routine is included based on the value of the pulse of heat flux, the temperature measurement uncertainty, the thermal properties of the material, and the physical properties of the rotor casing. 23 06 2018 27 06 2018 Aerothermodynamics Convective heat...

... by Lemmon et al. [ 13 ] or based on the equilibrium of mechanical, thermal, and fluid phase assumptions, such an approach is detailed in the published work by Lund and Flatten [ 14 ]. The accuracy of the speed of sound can also be improved by using the two methods simultaneously. With the utilization...

... systems Engines Experimental Finite element Internal combustion engines Modeling Power Thermal Turbines Control systems Co- generation Hybridized and fully electrified boosting technologies have become increasingly popular in recent years. Engine-boosting provides advantages in terms...

.... The degradations are flow capacity degradation and isentropic efficiency degradation. An engine model was created in Cranfield gas turbine performance and diagnostics software, pythia . Blade thermal and stress models were developed together with the Larson–Miller parameter (LMP) method for creep life analysis...

... efficiencies for both wet and combined cycles. We also show that when optimally used, nonreactive matter transfers, like water, provide an alternative, but not superior, thermal regeneration strategy to direct heat regeneration. Matter transfers are considered relative to the main stream, which is either dry...

... , J. E. , 1999 , “ Development of High-Density Arrays of Thin Film Heat Transfer Gauges ,” ASME/JSME Thermal Engineering Joint Conference, San Diego, CA, Mar. 14–19, Paper No. AJTE99-6159. [11] Lindsay , A. L. , and Bromley , L. A. , 1950 , “ Thermal Conductivity of Gas Mixtures ,” Ind...

... transfer functions to predict the disk's thermal response over a typical flight. The model uses only typically available full authority digital electronic control (FADEC) measurements to predict temperature with accuracy of ±30 K over the whole flight cycle. A Kalman filter has also been developed based...

... of methodological improvement are analyzed and proposed in the frame of an integrated approach for steam turbine components thermostructural analysis, reliability, and lifetime prediction. The full scope of the engineering tasks includes aero/thermodynamic flow path and secondary flows analysis to determine thermal...

... for fast starts. In current practice, turbine start-up limitations are set by consideration of thermal stress and low cycle fatigue. However, the pursuit of faster starts raises the question whether other thermal phenomena can become a limiting factor to the start-up process. Differential expansion (DE...

...Larry Lebel; Sylvain Turenne; Rachid Boukhili This paper presents an experimental procedure developed to simulate the behavior of ceramic matrix composites (CMCs) under the cyclic thermal stresses of a gas turbine combustion chamber. An experimental apparatus was assembled that produces...

... closures, through the frictional heat generated at the leaf–rotor interface when in contact, represents an important challenge for leaf seal analysis and design. This coupling can lead to leaf wear and loss, rotor overheating, and possibly to unstable sealing system behavior (thermal runaway...

...Julien Pohl; Harvey M. Thompson; Ralf C. Schlaps; Shahrokh Shahpar; Vincenzo Fico; Gary A. Clayton At present, it is a common practice to expose engine components to main annulus air temperatures exceeding the thermal material limit in order to increase the overall engine performance...

...Xijia Wu; Zhong Zhang; Leiyong Jiang; Prakash Patnaik Nozzle guide vanes (NGV) of gas turbine engines are the first components to withstand the impingement of hot combustion gas and therefore often suffer thermal fatigue failures in service. A lifting analysis is performed for the NGV of a gas...

...Travis A. Cable; Luis San Andrés; Karl Wygant Multiple-stage integrally geared compressors (IGCs) offer improved thermal efficiency and easier access for maintenance and overhaul than single-shaft centrifugal compressors. In an IGC, a main bull shaft drives pinion shafts, each having an impeller...

..., precise boundary conditions in terms of local temperatures as well as heat transfer coefficients are essential. In order to gain such information and understand the flow physics behind them, more and more complex thermal modeling approaches are necessary, like computational fluid dynamics (CFD) or even...

...Steffen Kahlert; Hartmut Spliethoff Intermittency of renewable electricity generation poses a challenge to thermal power plants. While power plants in the public sector see a decrease in operating hours, the utilization of industrial power plants is mostly unaffected because process steam has...

... . Manuscript received May 10, 2015; final manuscript received December 19, 2015; published online March 22, 2016. Assoc. Editor: Herman Shen. 10 05 2015 19 12 2015 Experimental Fatigue Modeling Stress analysis Thermal Turbines Continuously elevated steam pressure...

...Monika Topel; Markus Jöcker; Sayantan Paul; Björn Laumert In order to improve the startup flexibility of steam turbines, it becomes relevant to analyze their dynamic thermal behavior. In this work, the relative expansion between rotor and casing was studied during cold-start conditions...

... received January 31, 2015; published online April 28, 2015. Editor: David Wisler. 29 11 2014 31 01 2015 28 04 2015 Two-dimensional thermal profiles were experimentally measured downstream of a single row of film cooling holes on both an adiabatic and a matched Biot number model...