Comparative Study of a Felt Abradable Seal

2018 ◽  
Author(s):  
Dan Hasnedl ◽  
Premysl Epikaridis
Keyword(s):  
State Of The Art ◽  
Analytical Formula ◽  
Operating Conditions ◽  
Test Method ◽  
Experimental Comparison ◽  
Maximum Efficiency ◽  
Test Results ◽  
Test Rig ◽  
New Type ◽  
Efficiency Gap

In turbo-machinery, abradable layers are used to protect sensible components while keeping minimal possible clearances for maximum efficiency. This article describes the experimental comparison of state of the art abradable layers used as steam turbine seals and a new type of abradable layer made of a metallic felt. The comparison is done via abradability and leakage testing. The leakage is also compared to a state of the art analytical formula to show the effect on the thermal cycle calculation. An abradable test rig is presented together with the test method. Test results show the value of the Felt seal compared to other two types at low contact speed area. A steam test rig is also presented. Seal leakage at real operating conditions is evaluated and compared to an analytical formula. The leakage results show some efficiency gap compared to other two types of seals.

Introduction and Commissioning of the New Darmstadt Transonic Compressor Test Facility

2019 ◽  
Author(s):  
Christian Kunkel ◽  
Jan Werner ◽  
Daniel Franke ◽  
Heinz-Peter Schiffer ◽  
Fabian Wartzek ◽  
...  
Keyword(s):  
Control Systems ◽  
Gas Turbines ◽  
State Of The Art ◽  
Test Facility ◽  
Test Results ◽  
Test Rig ◽  
Vast Number ◽  
Transonic Compressor ◽  
Profound Knowledge ◽  
And Control

Abstract With the well-known Transonic Compressor Darmstadt (TCD) in operation since 1994, profound knowledge in designing and operating a sophisticated test-rig is available at the Institute of Gas Turbines and Aerospace Propulsion of TU Darmstadt. During this period, TCD has been subject to a vast number of redesigns within different measurement campaigns (see [1], [2], [3], [4], [5], [6], [7], [8]). To expand the capabilities and ensure a sustainable process of compressor research, a new test facility was designed and built by the institute. The new test rig Transonic Compressor Darmstadt 2 (TCD2) features increased power for higher pressure ratios and higher mass-flow, a state of the art control system, increased flexibility towards different compressor geometries and modern data acquisition hardware and software. Following the successful commissioning of the test-rig in March 2018, a first measurement campaign has been conducted. Early test results regarding aerodynamic performance and aeroelastic effects of the test compressor are presented together with a detailed overview of test-rig infrastructure and control systems as well as the test compressor and the measurement hardware.

Lubricant Influence on Gear Efficiency

2009 ◽  
Author(s):  
Klaus Michaelis ◽  
Bernd-Robert Ho¨hn ◽  
Andreas Doleschel
Keyword(s):  
Power Loss ◽  
Energy Savings ◽  
Operating Conditions ◽  
Test Method ◽  
Test Results ◽  
Additive Package ◽  
Mean Values ◽  
Base Oil ◽  
Power Loss Reduction ◽  
Gear Efficiency

Power loss in a transmission is strongly related to the properties of the gear lubricant. Viscosity of the lubricant determines the no-load splash and churning losses. The losses in the EHD regime depend on the base oil type. In the boundary and mixed lubrication regime losses are mainly related to the chemical composition of the additive system. A test method was developed to evaluate the frictional properties of candidate transmission lubricants in relation to a mineral reference oil ISO VG 100 with a typical sulphur-phosphorus additive package. The test results can be expressed in simple correlation factors for no-load, EHD and boundary lubrication conditions, in comparative steady-state temperature development for given mean values of operating conditions, and in a ranking scale of different candidates. For a more detailed analysis of the expected power loss in a transmission in practice the results of the efficiency test can be introduced into an equation for the mean coefficient of gear friction for the respective oil. Thus the test results can be applied to any gear in practice at any operating conditions for any gear geometry. Examples of the influence of viscosity, base oil and additive type on the frictional behavior of gear lubricants and their effect on power loss reduction and energy savings in a gearbox are discussed.

scholarly journals High Temperature, Permanent Magnet Biased, Fault Tolerant, Homopolar Magnetic Bearing Development

2008 ◽  
Author(s):  
Alan Palazzolo ◽  
Randall Tucker ◽  
Andrew Kenny ◽  
Kyung-Dae Kang ◽  
Varun Ghandi ◽  
...  
Keyword(s):  
High Temperature ◽  
Design Methodology ◽  
Permanent Magnets ◽  
Fault Tolerant ◽  
State Of The Art ◽  
Magnetic Bearing ◽  
Test Results ◽  
Test Rig ◽  
Control Forces ◽  
Good Agreement

This paper summarizes the development of a magnetic bearing designed to operate at 1,000F. A novel feature of this high temperature magnetic bearing is its homopolar construction which incorporates state of the art high temperature, 1,000F, permanent magnets. A second feature is its fault tolerance capability which provides the desired control forces with over one-half of the coils failed. The construction and design methodology of the bearing is outlined and test results are shown. The agreement between a 3D finite element, magnetic field based prediction for force is shown to be in good agreement with predictions at room and high temperature. A 5 axis test rig will be complete soon to provide a means to test the magnetic bearings at high temperature and speed.

Development of a Heavy Duty GT Syngas Burner for IGCC Power Plant in Order to Enlarge the GT Operating Conditions

2006 ◽  
Author(s):  
Federico Bonzani ◽  
Paolo Gobbo
Keyword(s):  
Atmospheric Pressure ◽  
Coal Gasification ◽  
Working Condition ◽  
Operating Conditions ◽  
Test Results ◽  
Customer Requirements ◽  
Test Rig ◽  
Gasification Process ◽  
Fuel Flexibility ◽  
Current Design

In order to increase the fuel flexibility of the current design of the SynGas burner [4,5,6], Ansaldo Energia, since the growing requests of the market, performed a R&D financed project to use the SynGas fuel available as the unique fuel to feed the gas turbine. Therefore the new working condition to be fulfilled by the modified SynGas burner are the following: a) ignition; b) acceleration; c) loading at part load; d) change over from diffusion line to main SynGas line. To fulfill with new requirements, the standard V94.2K burners have been modified in order to operate from ignition up to the change over point with a SynGas mixture provided by the coal gasification process of a typical IGCC plant [7]. After the design phase, a experimental test campaign on the new design burner has been performed at atmospheric pressure. In order to validate the test results carried out at actual engine working conditions a further test campaign has been performed at the high pressure consistent with the test rig technical limitations [2.3]. The paper show the results carried out that are really promising to meet the customer requirements.

An Off-Resonance Synchronous Vibration Based Method for Rotor System Damage Detections

2005 ◽  
Author(s):  
Huageng Luo ◽  
Hector Rodriguez ◽  
Darren Hallman ◽  
Dennis Corbly
Keyword(s):  
Final Section ◽  
State Of The Art ◽  
Detection System ◽  
Detection Algorithm ◽  
Integrated System ◽  
Test Results ◽  
Test Rig ◽  
Test Setup ◽  
First Order ◽  
Vibration Detection

This paper presents a methodology of detecting rotor imbalances, such as mass imbalance and crack-induced imbalance, using shaft synchronous vibrations. A vibration detection algorithm is derived based on the first order nonresonant synchronous vibration response. A detection system is integrated by using state-of-the-art commercial analysis equipment. A laboratory rotor test rig with controlled mass imbalances was used to verify the integrated system. The system is then deployed to an engine sub-assembly test setup. Four specimens were used in the subassembly test and the test results are reported in the final section.

scholarly journals Leakage and Power Loss Test Results for Competing Turbine Engine Seals

2004 ◽  
Author(s):  
Margaret P. Proctor ◽  
Irebert R. Delgado
Keyword(s):  
High Temperature ◽  
Power Loss ◽  
High Speed ◽  
Operating Conditions ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Test Results ◽  
Test Rig ◽  
Labyrinth Seals ◽  
Turbine Engine

Advanced brush and finger seal technologies offer reduced leakage rates over conventional labyrinth seals used in gas turbine engines. To address engine manufactures’ concerns about the heat generation and power loss from these contacting seals, brush, finger, and labyrinth seals were tested in the NASA High Speed, High Temperature Turbine Seal Test Rig. Leakage and power loss test results are compared for these competing seals for operating conditions up to 922 K (1200 °F) inlet air temperature, 517 KPa (75 psid) across the seal, and surface velocities up to 366 m/s (1200 ft/s).

scholarly journals Rheological Method for Alpha Test Evaluation of Developing Superplasticizers’ Performance: Channel Flow Test

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Jae Hong Kim ◽  
Jin Hyun Lee ◽  
Tae Yong Shin ◽  
Jin Young Yoon
Keyword(s):  
Channel Flow ◽  
Test Method ◽  
Test Evaluation ◽  
Test Results ◽  
Self Consolidating Concrete ◽  
Mix Proportion ◽  
Flow Test ◽  
Rheological Method ◽  
New Type ◽  
High Range

Advance in high-range water-reducing admixture revolutionizes the workability and constructability of conventional vibrated concrete as well as self-consolidating concrete. Its need from construction fields has increased, and consequently a variety of new-type polycarboxylates, base polymers for the admixture, are being formulated in these days. Synthesizing new polymers needs a quick, but reliable, test to evaluate its performance on concrete. The test is also asked for selecting the best applicable brand of them before a test concrete will be mixed. This paper proposes a “channel flow test” and its usage for the purpose. The proposed procedure for the test includes the mix proportion of a test mortar, the test method, and rheological interpretation of the test results.

Experimental and Numerical Investigation of Losses in Centrifugal Compressor Components

2013 ◽  
Author(s):  
Ali Asghar Doustmohammadi ◽  
Ali HajilouyBenisi ◽  
Mohammad Mojaddam
Keyword(s):  
Entropy Generation ◽  
Performance Prediction ◽  
Operating Conditions ◽  
Test Results ◽  
Test Rig ◽  
University Of Technology ◽  
Performance Curves ◽  
Stationary Component ◽  
Wide Operating ◽  
Good Agreement

In this research an analytical model for performance prediction of centrifugal compressors is developed. The loss mechanisms are investigated in impeller, diffuser and volute separately for wide operating rotational speeds of the compressor. The contributions of compressor components in total entropy generation are further studied using different experimental correlations and methods. The results are verified using experimental test results, carried out at Sharif University of technology Turbocharger laboratory which has been designed to derive performance curves of turbocharger compressors. The test rig is equipped to measure static and stagnation pressures at inlet and outlet of each component to determine the total pressure drop of each one. The model results show good agreement with experimental results. The results show the losses which are related to the impeller are higher than stationary component losses at design and off design operating conditions and the incidence loss is the main source of entropy generation in off design conditions. Also the diffuser losses increase with increasing mass flow rate while volute losses decrease.

Elimination of Turbine Erosion in the T56 Turboprop Engine

1965 ◽  
Author(s):  
J. G. Tomlinson ◽  
L. N. Montgomery
Keyword(s):  
Direct Evidence ◽  
Carbon Particle ◽  
Quantitative Measure ◽  
Operating Conditions ◽  
Test Method ◽  
Test Results ◽  
Fuel Type ◽  
Carbon Particles ◽  
Turboprop Engine ◽  
Service Operation

Turbine erosion was encountered in service operation with the T56 turboprop engine. Combustor carboning was suspected to be the cause of the problem. No direct evidence of carboning had been observed during development or in more than one million hours of service operation. An accelerated investigation was initiated to establish a quantitative measure of carbon particles in the combustor exhaust gases. A unique test method was developed to collect carbon particles on a component combustor test rig. Evaluations were conducted with the carbon collector to determine the effects of fuel nozzles, fuel type, operating conditions, and combustor configuration on carbon particle output. The combustor configuration was found to be the most important factor in the control of the problem. Combustor carboning was established as the cause of turbine erosion and a combustion liner modification was developed for service release. Service tests were conducted to correlate development test results and to verify that turbine erosion was eliminated with the modified combustion lines.

Investigations of Road Wear Caused by Studded Tires

2014 ◽  
Vol 42 (1) ◽  
pp. 2-15
Author(s):  
Johannes Gültlinger ◽  
Frank Gauterin ◽  
Christian Brandau ◽  
Jan Schlittenhard ◽  
Burkhard Wies
Keyword(s):  
Traffic Safety ◽  
Test Bench ◽  
Operating Conditions ◽  
Test Method ◽  
Analytical Models ◽  
The Road ◽  
Driving Speed ◽  
Major Factors ◽  
Tire Friction ◽  
Variable Operating Conditions

ABSTRACT The use of studded tires has been a subject of controversy from the time they came into market. While studded tires contribute to traffic safety under severe winter conditions by increasing tire friction on icy roads, they also cause damage to the road surface when running on bare roads. Consequently, one of the main challenges in studded tire development is to reduce road wear while still ensuring a good grip on ice. Therefore, a research project was initiated to gain understanding about the mechanisms and influencing parameters involved in road wear by studded tires. A test method using the institute's internal drum test bench was developed. Furthermore, mechanisms causing road wear by studded tires were derived from basic analytical models. These mechanisms were used to identify the main parameters influencing road wear by studded tires. Using experimental results obtained with the test method developed, the expected influences were verified. Vehicle driving speed and stud mass were found to be major factors influencing road wear. This can be explained by the stud impact as a dominant mechanism. By means of the test method presented, quantified and comparable data for road wear caused by studded tires under controllable conditions can be obtained. The mechanisms allow predicting the influence of tire construction and variable operating conditions on road wear.

Sign in / Sign up

Export Citation Format

Share Document