...Christopher Zeh; Ole Willers; Thomas Hagemann; Hubert Schwarze; Jörg Seume While turbocharging is a key technology for improving the performance and efficiency of internal combustion engines, the operating behavior of the turbocharger is highly dependent on the rotor temperature distribution...

... q = heat flux Q ˙ = rate of heat flow Re = Reynolds-number r = radius s = specific entropy t = time T = temperature T ¯ = surface average temperature u = circumferential velocity V = volume w...

... the high-pressure compressor, and this cooling air is also used to reduce the ingress. The engine designer needs to predict the stator and rotor temperatures as a function of cooling-flow rate. The sealing effectiveness determines how much air is needed to reduce or prevent ingress; although...

... , density, ρ , and viscosity, μ , can be calculated using the above equations. The instantaneous values for temperature, T , and enthalpy, h , can be calculated with the assistance of the functions T P , s , and h P , s offered in REFPROP, which can be linked...

...Clare Bonham; Mark Brend; Adrian Spencer; Katsu Tanimizu; Dylan Wise Steady-state stagnation temperature probes are used during gas turbine engine testing as a means of characterizing turbomachinery component performance. The probes are located in the high-velocity gas-path, where temperature...

...). A three-dimensional computational fluid dynamics (3D CFD) model was developed using CONVERGE CFD coupled with detailed chemical kinetics to gain a better understanding of the underlying phenomena of the water injection event in a homogeneous, low temperature combustion (LTC) strategy. The CFD model...

... react with ammonia (NH 3 ) to form nitrogen and water vapor. The reaction is influenced by several variables, including stored ammonia on the catalyst, exhaust gas composition, and catalyst temperature. Currently, measurements from NO x and/or NH 3 sensors upstream and downstream of the SCR are used...

... by an industrial lean premixed, axial swirl fuel nozzle. Planar particle image velocimetry (PIV) data were analyzed to understand the characteristics of the flow field. Liner surface temperatures were measured in reacting condition with an infrared camera for a single case. Experiments were conducted at Reynolds...

...Masahiro Negami; Shinya Hibino; Akihito Kawano; Yoshimichi Nomura; Ryozo Tanaka; Kenichiroh Igashira Durability of thermal barrier coating (TBC) systems is important because of recent rising of turbine inlet temperature (TIT) for improved efficiency of industrial gas turbine engines. However, high...

.... The piston maximun temperature (PMT) of the dual fuel engine easily exceeds the security border. In view of this, this paper proposes a method based on the lasso regression to estimate the PMT of the dual fuel engine, so as to real-timely monitor the health state of the dual fuel engine. Specifically, PMTs...

... = signal generator voltage Z leak = leakage impedance Z load = load resistor impedance Z sensor = sensor electrode impedance Δ T = relative temperature difference In future work, using a calibration method such as a needle contact probe will improve the probes...

... for predicting temperatures and heat transfers for other bearing models. The result of the analysis shows that the predictions of the TN are considerate, despite the simplifications. However, lower relative errors were obtained in the FE model compared to the TN model. For both methods, the highest relative...

... the engineered design of solid–solid and liquid–solid interfaces in dissimilar functionalized materials to establish a paradigm shift toward science from the traditional empiricism in engineering TBCs and high temperature highly loaded bulk materials. An integrated approach of modeling and simulation...

... as a function of equivalence ratio at different fuel staging percentages (1 psi = 6894.76 Pa) The target operating range for the experiment is as follows: a fixed inlet velocity ( U ) of 26 m/s, a fixed inlet temperature ( T in ) of 473 K, and an equivalence ratio range from 0.65 to 0.73. Transitions...

...Ryan O'Donnell; Tommy Powell; Mark Hoffman; Eric Jordan; Zoran Filipi Thermal barrier coatings (TBCs) applied to in-cylinder surfaces of a low temperature combustion (LTC) engine provide an opportunity for enhanced efficiency via two mechanisms: (i) positive impact on thermodynamic cycle efficiency...

..., showed an increased burn duration at higher iEGR levels. When comparing PRF40 to gasoline at fixed combustion phasing and iEGR level, the increased HRR for PRF40 was correlated with reduced intake valve closing (IVC) temperatures. To examine the impact of thermal gradients (as distinct from fuel...

... a temperature gradient across the thickness of a CMC specimen while holding the specimen at its two extremities, which simulates the bending stress that would be observed at the center of a combustor panel. Preliminary validation tests were performed in which A-N720 oxide–oxide CMC specimens were heated...

...Gregoire Witz; Markus Schaudinn; Joerg Sopka; Tobias Buecklers Continuously increasing hot gas temperatures in heavy duty gas turbines lead to increased thermal loadings of the hot gas path materials. Thermal barrier coatings (TBCs) are used to reduce the superalloys temperature and cooling air...

...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...

... temperature. A systematic parametric study is presented giving insight into the influence of number of bolts, mass flow rate, cavity gap ratio, and the bolts-to-shroud gap ratio on the time-dependent flow within the cavity. 1 Corresponding author. Contributed by the Heat Transfer Committee of ASME...