A Novel Controlled-Motion Test Rig to Evaluate Effect of Synchronous and Subsynchronous Lateral Vibration on Reliability and Performance of Mechanical Seals in Pumps

2021 ◽  
Author(s):  
Clay S Norrbin ◽  
Adolfo Delgado
Keyword(s):  
Lateral Vibration ◽  
Mechanical Seals ◽  
Test Rig ◽  
Controlled Motion ◽  
And Performance

A Novel Controlled-Motion Test Rig to Evaluate Effect of Synchronous and Subsynchronous Lateral Vibration on Reliability and Performance of Mechanical Seals in Pumps

2020 ◽  
Author(s):  
Clay S. Norrbin ◽  
Adolfo Delgado
Keyword(s):  
Mineral Oil ◽  
Mechanical Seal ◽  
Mechanical Seals ◽  
Test Rig ◽  
Flow Loop ◽  
Rotating Shaft ◽  
Premature Failure ◽  
Frequency Independent ◽  
Controlled Motion ◽  
And Performance

Abstract Mechanical seals are commonly used in rotating machinery to contain liquid leakage past a rotating shaft. Pumps vibration often exhibit both synchronous and sub-synchronous whirling, which may lead to premature failure of mechanical seals. A test rig was developed to simulate a running pump environment for the mechanical seal. The controlled-motion test rig comprises a flexibly-mounted-rotor connected to a pair of electrohydraulic shakers. This configuration allows imposing whirl orbits to a flexibly-mounted-rotor (FMR) mechanical seal at any prescribed frequency independent of rotor speed. A 6-axis load cell provides direct measurements of the reaction forces at the mechanical seal stationary component. Five Eddy current sensors and capacity probes track the 5 DOFs of the mechanical seal dynamic face. The flow loop is a modified plan 54 with an external pump capable of delivering 32 lpm at 14 bar using VG 2 mineral oil, and an external heat exchanger to regulate oil temperature. Tests were performed on a 3-inch (76.2 mm) FMR seal. Input rotor whirl vibration was increased to 10 mils pk-pk (254 microns), while cooling flow (VG2 mineral oil) was set to 8 lpm and pressure was varied from 1.7–6.9 lpm. The measurements include steady state values of temperature, power loss, clearance and leakage; and dynamic measurements of seal face wobble, wobble-imposed torque, relative lateral movement and fluid film shear.

Optimization design for mechanical seals in reactor coolant pumps based on a fluid–solid strong-interaction model

2011 ◽  
Vol 225 (8) ◽  
pp. 1851-1862 ◽  
Author(s):  
C-J Liao ◽  
W-F Huang ◽  
Y-M Wang ◽  
S-F Suo ◽  
X-F Liu
Keyword(s):  
Strong Interaction ◽  
Optimization Design ◽  
Power Plants ◽  
Interaction Model ◽  
Reactor Power ◽  
Mechanical Seals ◽  
Pressurized Water ◽  
Reactor Coolant ◽  
The Operating Mechanism ◽  
And Performance

The study on the mechanism and performance of the mechanical seals in reactor coolant pumps (RCPs) is very important for the safe operations of pressurized water reactor power plants. By exploring the operating mechanism of the first seal of the hydrostatic mechanical seal in RCPs, an analytical fluid–solid strong-interaction model of the seal is proposed in this article. The model holds that the mechanical deformations of the seal assembly are dominated by the deflections of the seal rings, and this idea is demonstrated by the numerical simulation result of a fluid–solid interaction (FSI) model. Using the analytical FSI model, the regularity that the leakage rate of the first seal varies with the differential pressure in a RCP is obtained, and compared with the operational data, which is used to verify the model. Based on the understanding of the reliability of the seal, a dimensionless parameter Λ that acts as an attribute to the reliability is proposed in this article. Using the analytical FSI model and Λ as the optimization algorithm and optimization object, respectively, the optimum designs about the seal faceplateconfigurations are performed. Also, the specific optimization conclusions are given simultaneously.

Status of the Automotive Ceramic Gas Turbine Development Program: Year Five Progress

1996 ◽  
Author(s):  
Tsubura Nisiyama ◽  
Norio Nakazawa ◽  
Masafumi Sasaki ◽  
Masumi Iwai ◽  
Haruo Katagiri ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Development Program ◽  
Ceramic Materials ◽  
Inlet Temperature ◽  
Test Rig ◽  
Target Values ◽  
Ceramic Components ◽  
Combined Test ◽  
And Performance ◽  
The Individual

Petroleum Energy Center of Japan has been carrying out a 7-year development program to prove the potential of an automotive ceramic gas turbine for five years with the support of the Ministry of International Trade and Industry. The ceramic gas turbine now under development is a regenerative single shaft engine. The output is 100kW, and the turbine inlet temperature (TIT) is 1350°C. All the ceramic components are now entering the 1350°C TIT test phase after completing 1200°C TIT evaluation tests, including durability tests, in various types of test rigs. The compressor-turbine combined test rig and the full assembly test rig which is the same as an actual engine and incorporates all the components are now going through 1200°C TIT function and performance evaluation tests. In the near future, we are planning to increase the TIT to 1350°C. In consideration of the current level of high-temperature, long-term strength available from the ceramic materials, we decided to change the rated speed to 100,000 rpm because the initial rated speed of 110,000 rpm, if unchanged, involves considerable risks. Then we reviewed mainly the designs of the compressor and turbine and revised the target values of the individual components to match the specifications that satisfy the target performance of the engine.

DESIGN OF COMBUSTOR FOR MICRO GAS TURBINE TEST RIG AND ITS PERFORMANCE PREDICTION

2015 ◽  
Vol 77 (8) ◽  
Author(s):  
Feng Xian Tan ◽  
Srithar Rajoo ◽  
Meng Soon Chiong ◽  
Cheng Tung Chong ◽  
Alessandro Romagnoli ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Performance Prediction ◽  
Test Rig ◽  
Fuel Price ◽  
Power Generator ◽  
Micro Gas Turbine ◽  
Backup System ◽  
Range Extender ◽  
Auxiliary Power ◽  
And Performance

Stringent emission rules, air pollution, fluctuation of fuel price and depletion of fossil fuel resources are driving the industry to seek for better alternative of power generation. Micro gas turbine (MGT) provides a promising potential to solve the facing problems. MGT could be used in many applications such as in range extender vehicle, auxiliary power generator, power backup system, combine heat and power system, etc. Combustor plays a very crucial role in MGT system as its performance directly affects the emission quality, power output and fuel consumption of the entire system. This paper demonstrates the literature review, design methodology and performance prediction of the combustor designed for a 14.5kW MGT test rig.

Wave Rotor Combustor Test Rig Preliminary Design

2004 ◽  
Author(s):  
Berrak Alparslan ◽  
M. Razi Nalim ◽  
Philip H. Snyder
Keyword(s):  
Computational Models ◽  
Combustion Process ◽  
Constant Volume ◽  
Operating Conditions ◽  
Experimental Program ◽  
Preliminary Design ◽  
Wave Rotor ◽  
Test Rig ◽  
Operating Cycle ◽  
And Performance

Pressure gain combustion in a wave rotor approaching the thermodynamic ideal of constant volume combustion has been proposed to significantly enhance the performance of gas turbine engines. A computational and experimental program is currently being conducted to investigate the combustion process and performance of a wave rotor with detonative and near-detonative internal combustion. An innovative and flexible preliminary design of the test rig is presented to demonstrate the operation and performance of the system. A preliminary design method based on a sequence of computational models is used to design wave processes for testing in the rig and to define rig geometry and operating conditions. The operating cycle allows for propagation of the combustion front from the exit end of the combustion channel to the inlet end. This is similar to and motivated by the Constant Volume Combustor (CVC) concept that seeks to produce a relatively uniform set of outflow conditions in both spatial and time coordinates.

Combustion System Development and Testing for MAN’s New Industrial Gas Turbines MGT 6100 and MGT 6200

2014 ◽  
Author(s):  
Frank Reiss ◽  
Sven-Hendrik Wiers ◽  
Ulrich Orth ◽  
Emil Aschenbruck ◽  
Martin Lauer ◽  
...  
Keyword(s):  
High Pressure ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Test Facility ◽  
Combustion System ◽  
Test Rig ◽  
Low Emission ◽  
Pressure Test ◽  
Industrial Gas Turbines ◽  
And Performance

This paper describes the development and test results of the low emission combustion system for the new industrial gas turbines in the 6–7 MW class from MAN Diesel & Turbo. The design of a robust combustion system and the achievement of very low emission targets were the most important design goals of the combustor development. During the design phase, the analysis of the combustor (i.e. burner design, air distribution, liner cooling design) was supported with different CFD tools. This advanced Dry Low Emission can combustion system (ACC) consists of 6 cans mounted externally on the gas turbine. The behavior and performance of a single can sector was tested over a wide load range and with different boundary conditions; first on an atmospheric test rig and later on a high pressure test rig with extensive instrumentation to ensure an efficient test campaign and accurate data. The atmospheric tests showed a very good performance for all combustor parts and promising results. The high pressure tests demonstrated very stable behavior at all operation modes and very low emissions to satisfy stringent environmental requirements. The whole operation concept of the combustion system was tested first on the single-can high pressure test bed and later on twin and single shaft gas turbines at MAN’s gas turbine test facility. During the engine tests, the can combustors demonstrated the expected combustion performance under real operation conditions. All emissions and performance targets were fully achieved. On the single shaft engine, the combustors were running with single digit ppm NOx levels between 50% and 100% load. The validation phase and further optimization of the gas turbines and the engine components are ongoing. The highlights of the development process and results of the combustor and engine tests will be presented and discussed within this paper.

Development of a General Use Quarter-Vehicle Test Rig

2007 ◽  
Author(s):  
Justin Langdon ◽  
Steve C. Southward
Keyword(s):  
Effective Means ◽  
Academic Research ◽  
Cost Effective ◽  
Functional Requirements ◽  
Test Rig ◽  
Wide Range ◽  
Vehicle Test ◽  
And Performance ◽  
Improved Design ◽  
Vehicle Testing

This paper discusses the development of an improved design for a tire-coupled quarter-vehicle testing rig. The use of indoor-based simulation tools has become a mainstay in vehicle testing for the automotive and motorsports industries. Testing on a quarter-vehicle rig provides a cost effective means for making accurate and repeatable measurements that enables the user to perform a relatively large number of tests in a short amount of time. A review of current quarter-vehicle test platforms, both commercially available and in academic research labs, indicated that many desired functional requirements were not available. The goal of this effort was to develop a new quarter-vehicle rig with expanded capabilities that are not simultaneously present in the current state-of-the-art. The desired functional requirements are: accommodation of a wide range of actual vehicle suspension components including the tire and wheel, weight transfer due to braking and acceleration, aerodynamic forces, and vehicle roll. The test rig was constructed and tested using a Porsche 996 suspension. The suspension dynamics were characterized by fitting the parameters of a linear dynamic model to experimental response data from the rig. The design and performance of this new quarter-vehicle test rig is shown to be a cost effective solution for meeting the broad range of functional requirements.

Experimental and Numerical Investigation on Windage Power Losses in High Speed Gears

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
Daniele Massini ◽  
Tommaso Fondelli ◽  
Antonio Andreini ◽  
Bruno Facchini ◽  
Lorenzo Tarchi ◽  
...  
Keyword(s):  
High Speed ◽  
Spur Gear ◽  
Relative Magnitude ◽  
Navier Stokes ◽  
Power Losses ◽  
Test Rig ◽  
Viscosity Models ◽  
Image Velocimetry ◽  
And Performance ◽  
Aero Engines

Enhancing the efficiency of gearing systems is an important topic for the development of future aero-engines with low specific fuel consumption. An evaluation of its structure and performance is mandatory in order to optimize the design as well as maximize its efficiency. Mechanical power losses are usually distinguished into two main categories: load-dependent and load-independent losses. The former are all those associated with the transmission of torque, while the latter are tied to the fluid dynamics of the environment, which surrounds the gears. The relative magnitude of these phenomena is dependent on the operative conditions of the transmission: load-dependent losses are predominant at slow speeds and high torque conditions, load-independent mechanisms become prevailing in high speed applications, like in turbomachinery. A new test rig was designed for investigating windage power losses resulting by a single spur gear rotating in a free oil environment. The test rig allows the gear to rotate at high speed within a box where pressure and temperature conditions can be set and monitored. An electric spindle, which drives the system, is connected to the gear through a high accuracy torque meter, equipped with a speedometer providing the rotating velocity. The test box is fitted with optical accesses in order to perform particle image velocimetry (PIV) measurements for investigating the flow field surrounding the rotating gear. The experiment has been computationally replicated, performing Reynolds-averaged Navier–Stokes (RANS) simulations in the context of conventional eddy viscosity models, achieving good agreement for all of the speed of rotations.

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