Calculation Model Based Design-Point Gas Generator Performance Adaptation Method

2017 ◽  
Author(s):  
Shiyao Li ◽  
Zhenlin Li ◽  
Ning Huang
Keyword(s):  
Simulation Model ◽  
Flow Rate ◽  
Calculation Model ◽  
Adaptation Process ◽  
Performance Parameters ◽  
Gas Generator ◽  
Performance Simulation ◽  
And Performance ◽  
Performance Adaptation ◽  
Adaptation Method

Accurate performance simulation can provide operating parameters and performance parameters for the gas turbine’s optimization, maintenance, and fault diagnosis. However, the components maps necessary for performance simulation are not publically available. In addition, the same type of gas turbine has slightly different component operating characteristics due to components′ variations in status and assembly tolerance. These causes bring real difficulties to the research of performance simulation. In order to obtain accurate components characteristics and performance simulation results, the original or generic components maps should be modified by the scaling factors. In the process of calculating scaling factors, the simulation model is applied repeatedly to determine the engine’s actual performance parameters until the simulated gas path thermal parameters are compatible with the actual measureable data. This paper introduces a new adaptation method and substitutes the calculation model with the simulation model in the adaptation process. It directly calculates the mass flow rate, isentropic efficiency, and pressure ratio of compressor and turbine based on measureable parameters such as gas path temperature, pressure, fuel component and mass flow rate. Moreover, this paper introduces the virtual gas generator model that enhances the applicability of calculation model based performance adaptation method on gas generators with different structures. This method has been applied to GE PGT25+ gas generator (single-spool) and RR RB211-24G gas generator (double-spool). Compared with the simulation model used in adaptation process, performance calculation model is much simpler and less time consuming.

Investigation of Off-Design Performance of Vaned Diffusers in Centrifugal Compressors: Part II — A Low-Solidity Cascade Diffuser

2002 ◽  
Author(s):  
Jong-Sik Oh
Keyword(s):  
Secondary Flow ◽  
Flow Rate ◽  
Centrifugal Compressor ◽  
Three Dimensional ◽  
Flow Fields ◽  
Performance Parameters ◽  
Design Performance ◽  
And Performance ◽  
Compressor Map ◽  
Low Solidity Cascade Diffuser

As the second part of the author’s study, off-design behavior of the design and performance parameters in the low-solidity cascade diffuser in a centrifugal compressor is investigated. The experimental flange-to-flange compressor map serves the validity of application of the present CFD work to the detailed investigation of the low-solidity cascade diffuser. Some meanline design and performance parameters as well as three-dimensional internal secondary flow fields are studied when the flow rate is changed from deep choke to stall.

Performance Simulation of Turboprop Engine Using SIMULINK® Model

2002 ◽  
Author(s):  
Changduk Kong ◽  
Hongsuk Roh
Keyword(s):  
Steady State ◽  
Sea Level ◽  
Flow Rate ◽  
Pressure Ratio ◽  
Inlet Temperature ◽  
Performance Parameters ◽  
Performance Simulation ◽  
Simulink Model ◽  
First Case ◽  
Turboprop Engine

A performance simulation model of a turboprop engine, the PT6A-62, which is the power plant of KT-1, was developed to predict the steady-state behaviors using the SIMULINK® model. The SIMULINK model consists of subsystems to represent engine components such as intake, compressor, combustor, compressor turbine, power turbine and exhaust nozzle. For validation, performance parameters calculated using the SIMULINK model were compared with the results using GASTURB model. The steady-state performance analysis using the developed SIMULINK model was performed. Performance parameters, such as the mass flow rate, the compressor pressure ratio, the fuel flow rate, the specific fuel consumption ratio and the turbine inlet temperature, were conducted to evaluate validity of the SIMULINK model at various cases. The first case was the uninstalled condition at various altitudes from sea level to 9144m (30000ft) with fixed M.N. = 0. And the second case was the installed condition at various altitudes from sea level to 7620m (25000ft) with fixed M.N. = 0. The third case was the installed condition at altitudes of 1524m (5000ft) and 3048m (1000ft) and at the M.N. = 0.1, 0.2 and 0.3 in ECS operation ECS. In this investigation, it was confirmed that the results using the SIMULINK model were well agreed with the results using the GASTURB model within maximum 6.5%.

Research on flow rate engineering calculation model of U-pipes for fabricating transverse variable profiled (TVP) strips by simulation and experiment

2020 ◽  
Vol 117 (6) ◽  
pp. 604
Author(s):  
Ce Ji ◽  
Huagui Huang ◽  
Yifeng Sun ◽  
Chaoqun Zhang ◽  
Lin Gao ◽  
...  
Keyword(s):  
Flow Rate ◽  
Engineering Calculation ◽  
Cooling Capacity ◽  
Calculation Model ◽  
Inlet Pressure ◽  
Design Stage ◽  
Main Pipe ◽  
Inner Diameter ◽  
And Performance ◽  
Pipe Inlet

Transverse variable profiled (TVP) strips have significant lightweight and functional characteristics due to the nonuniform section, but need to be cooled nonuniformly in order to obtain the uniform microstructure and performance. Hence, it has become the consensus of the industry to develop new on-line cooling equipment that can adjust and control the cooling capacity along the width direction (WD). Therefore, a multi-functional test platform was designed based on the U-pipes used in the industrial runout table cooling process. A steady-state Computational Fluid Dynamics (CFD) model was built based on the Fluent software, and the influence of the main pipe inlet pressure, U-pipe inner diameter, restrictor ring thickness, and restrictor ring inner diameter was analyzed. The results indicate that the flow rate increases as the U-pipe inner diameter increase when there is no restrictor ring, and the result is contrary when there is a restrictor ring. The influence of main pipe inlet pressure, restrictor ring thickness, and restrictor ring inner diameter on the flow rate is monotonic. Besides, the restrictor ring inner diameter has a wide flow rate adjusting range and has little impact on the equipment structure, which helps to reduce the reconstruction cost. Finally, considering the influence of geometric parameters, the flow rate engineering calculation models of the U-pipe were derived and verified, which lays the theoretical foundation to customize the flow rate distribution along the WD at the design stage.

Novel epoxy/anhydride alternatives for biological electron microscopy: Physical and performance characteristis of embed 812 and LX 112 in combination with NSA/NMA/DMAE

1989 ◽  
Vol 47 ◽  
pp. 1000-1001
Author(s):  
Joe A. Mascorro ◽  
Gerald S. Kirby
Keyword(s):  
Electron Microscopy ◽  
Flow Rate ◽  
Succinic Anhydride ◽  
Volume Flow Rate ◽  
Mass Density ◽  
Uranyl Acetate ◽  
Volume Flow ◽  
Base Resin ◽  
And Performance ◽  
Acid Anhydrides

Embedding media based upon an epoxy resin of choice and the acid anhydrides dodecenyl succinic anhydride (DDSA), nadic methyl anhydride (NMA), and catalyzed by the tertiary amine 2,4,6-Tri(dimethylaminomethyl) phenol (DMP-30) are widely used in biological electron microscopy. These media possess a viscosity character that can impair tissue infiltration, particularly if original Epon 812 is utilized as the base resin. Other resins that are considerably less viscous than Epon 812 now are available as replacements. Likewise, nonenyl succinic anhydride (NSA) and dimethylaminoethanol (DMAE) are more fluid than their counterparts DDSA and DMP- 30 commonly used in earlier formulations. This work utilizes novel epoxy and anhydride combinations in order to produce embedding media with desirable flow rate and viscosity parameters that, in turn, would allow the medium to optimally infiltrate tissues. Specifically, embeding media based on EmBed 812 or LX 112 with NSA (in place of DDSA) and DMAE (replacing DMP-30), with NMA remaining constant, are formulated and offered as alternatives for routine biological work.Individual epoxy resins (Table I) or complete embedding media (Tables II-III) were tested for flow rate and viscosity. The novel media were further examined for their ability to infilftrate tissues, polymerize, sectioning and staining character, as well as strength and stability to the electron beam and column vacuum. For physical comparisons, a volume (9 ml) of either resin or media was aspirated into a capillary viscocimeter oriented vertically. The material was then allowed to flow out freely under the influence of gravity and the flow time necessary for the volume to exit was recored (Col B,C; Tables). In addition, the volume flow rate (ml flowing/second; Col D, Tables) was measured. Viscosity (n) could then be determined by using the Hagen-Poiseville relation for laminar flow, n = c.p/Q, where c = a geometric constant from an instrument calibration with water, p = mass density, and Q = volume flow rate. Mass weight and density of the materials were determined as well (Col F,G; Tables). Infiltration schedules utilized were short (1/2 hr 1:1, 3 hrs full resin), intermediate (1/2 hr 1:1, 6 hrs full resin) , or long (1/2 hr 1:1, 6 hrs full resin) in total time. Polymerization schedules ranging from 15 hrs (overnight) through 24, 36, or 48 hrs were tested. Sections demonstrating gold interference colors were collected on unsupported 200- 300 mesh grids and stained sequentially with uranyl acetate and lead citrate.

Effect of Feeding Bt176 Maize on Physiological and Performance Parameters in Broiler Chickens

2004 ◽  
Vol 15 (3) ◽  
pp. 246-246
Author(s):  
M.A. Tony ◽  
A. Butschke ◽  
J. Zagon ◽  
H. Broll ◽  
M. Schauzu ◽  
...  
Keyword(s):  
Broiler Chickens ◽  
Performance Parameters ◽  
And Performance ◽  
Effect Of Feeding

On the Influence of Fluctuating Flow Rate Upon the Performance and Behaviour of Isothermal Reacting Systems

1998 ◽  
Vol 63 (6) ◽  
pp. 881-898
Author(s):  
Otakar Trnka ◽  
Miloslav Hartman
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Fluidized Bed Reactor ◽  
Computational Techniques ◽  
Continuous Stirred Tank Reactor ◽  
Gas Flow Rate ◽  
Solid Reaction ◽  
Continuous Stirred Tank ◽  
And Performance ◽  
Reacting Systems

Three simple computational techniques are proposed and employed to demonstrate the effect of fluctuating flow rate of feed on the behaviour and performance of an isothermal, continuous stirred tank reactor (CSTR). A fluidized bed reactor (FBR), in which a non-catalytic gas-solid reaction occurs, is also considered. The influence of amplitude and frequency of gas flow rate fluctuations on reactant concentrations at the exit of the CSTR is shown in four different situations.

scholarly journals Macro Modeling of V-Shaped Electro-Thermal MEMS Actuator with Human Error Factor

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 622
Author(s):  
Dongpeng Zhang ◽  
Anjiang Cai ◽  
Yulong Zhao ◽  
Tengjiang Hu
Keyword(s):  
Neural Network ◽  
Simulation Model ◽  
Bp Neural Network ◽  
Human Error ◽  
Calculation Model ◽  
Fuzzy Mathematics ◽  
Ansys Simulation ◽  
Macro Modeling ◽  
Error Factor ◽  
Simulation Results

The V-shaped electro-thermal MEMS actuator model, with the human error factor taken into account, is presented in this paper through the cascading ANSYS simulation model and the Fuzzy mathematics calculation model. The Fuzzy mathematics calculation model introduces the human error factor into the MEMS actuator model by using the BP neural network, which effectively reduces the error between ANSYS simulation results and experimental results to less than 1%. Meanwhile, the V-shaped electro-thermal MEMS actuator model, with the human error factor included, will become more accurate as the database of the V-shaped electro-thermal actuator model grows.

scholarly journals Comparison of a Novel Polymeric Hollow Fiber Heat Exchanger and a Commercially Available Metal Automotive Radiator

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1175
Author(s):  
Tereza Kroulíková ◽  
Tereza Kůdelová ◽  
Erik Bartuli ◽  
Jan Vančura ◽  
Ilya Astrouski
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Hollow Fiber ◽  
Pressure Loss ◽  
Air Flow ◽  
Performance Parameters ◽  
University Of Technology ◽  
Flat Tubes ◽  
And Performance ◽  
Louvered Fins

A novel heat exchanger for automotive applications developed by the Heat Transfer and Fluid Flow Laboratory at the Brno University of Technology, Czech Republic, is compared with a conventional commercially available metal radiator. The heat transfer surface of this heat exchanger is composed of polymeric hollow fibers made from polyamide 612 by DuPont (Zytel LC6159). The cross-section of the polymeric radiator is identical to the aluminum radiator (louvered fins on flat tubes) in a Skoda Octavia and measures 720 × 480 mm. The goal of the study is to compare the functionality and performance parameters of both radiators based on the results of tests in a calibrated air wind tunnel. During testing, both heat exchangers were tested in conventional conditions used for car radiators with different air flow and coolant (50% ethylene glycol) rates. The polymeric hollow fiber heat exchanger demonstrated about 20% higher thermal performance for the same air flow. The efficiency of the polymeric radiator was in the range 80–93% and the efficiency of the aluminum radiator was in the range 64–84%. The polymeric radiator is 30% lighter than its conventional metal competitor. Both tested radiators had very similar pressure loss on the liquid side, but the polymeric radiator featured higher air pressure loss.

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