Wyniki wyszukiwania - BazTech

1

Determination of characteristics of pollutant emission from a vehicle engine under traffic conditions in the engine test

Andrych-Zalewska Monika, Chłopek Zdzisław, Merkisz Jerzy, Pielecha Jacek

Combustion Engines

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2022

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R. 61, nr 4

58--65

EN

The paper describes the method of determination of exhaust emission characteristics from a vehicle engine based on the results obtained in a driving test simulated on an engine dynamometer. These characteristics are the relations between the specific distance emissions and the zero-dimensional characteristics of the process of vehicle velocity: the average velocity value and the average value of the absolute value of the product of vehicle velocity and acceleration. The exhaust emission characteristics are used to simulate the emissions from vehicles operating in different types of traffic conditions. The engine operating states in the engine dynamometer tests were determined by the operating conditions of the vehicle during the test. The authors applied the Monte Carlo method in order to determine the characteristics of different values of the zero-dimensional characteristics of the vehicle velocity process. This enabled the determination of the characteristics based on the test results from a single realization of the process of vehicle velocity. Additionally, the developed method allowed a replacement of the empirical research on the chassis dynamometer with the one performed on the engine dynamometer. The obtained exhaust emission characteristics are in line with the characteristics obtained on the chassis dynamometer in multiple tests.

2

Method of preliminary evaluation of biocomponents influence on the process of biofuels combustion in aviation turbine engines

Kaźmierczak U., Kulczycki A.

Journal of KONES

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2017

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Vol. 24, No. 4

83--90

EN

The aim of this article is presentation of the new method of preliminary evaluation of biocomponents influence on the process of biofuels combustion in aviation turbine engines. This method is based on the tests of evaluated biofuels on engine stand MiniJetRig equipped with small turbine engine. The idea of this new method is to compare the combustion process of evaluated biofuel with the combustion of reference fuels. The reference fuel used in presented research was mineral Jet A1. Two compositions of pure hydrocarbons were blended with Jet A1 fuel and tested using MiniJetRig. The main criterion of combustion process assessment was CO concentration in exhaust gases. As the final criterion of evaluated biofuel the ΔCO = [COWx – COJet] was adopted, where COWx – the concentration of CO in exhaust gases emitted during combustion of evaluated fuel and COJet – the concentration of CO in exhaust gases emitted during combustion of Jet A1 fuel. This method was preliminary verified using HEFA biofuel previously accepted for aviation application. The obtained results qualify this biofuel as similar to Jet A1 ones – the DCO was within limits –30 – +20. The presented method needs further research, using much more evaluated fuels, to confirm their usefulness for laboratory pre-selection of new biofuels.

3

Efficiency of diesel engine fuelled with biofuels of second generation biox

Struś M., Rewolte M., Rogula J.

Journal of KONES

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2015

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Vol. 22, No. 4

311--317

EN

Paper presents schematic description of the research covering production mechanism of Fatty Acid Ethyl Esters (FAEE) from waste vegetable and animal fats, which are creating a base for multi-component fuel BIOXDIESEL as well as results of physical, chemical analysis and results of engine and vehicles tests. The characteristic of wasted material used for production of fatty acid ethyl esters is showed. Cybernetic chain of biofuel BIOXDIESEL, system analysis and structure and scheme of the chemical reaction of Ethanol esterification of fatty acids is presented. Basic properties of exemplary BIOXDIESEL and Diesel fuel were compared. Caloric values of investigated BIOXDIESELS are shown. Mixtures of the BIOXDIESEL fuels with various composition have been tested and compared with Diesel fuel during engine tests on the engine test bench, vehicle test dyno and drive tests. The diesel engines of Fiat 1.3 Multijet, Mercedes300D, Landrover and ADCR compression ignition engine were tested with biofuels. Functional schema of the measurement set up is described. Cyclodynes obtained during testing of the ADCR engine fuelled with Diesel and BIOXDIESEL fuels with their centres of gravity are presented. Obtained and described results in the form of tables and graphs can be summarized with conclusions, that the performance of engines fuelled with BIOX-DIESELS is similar to engines fuelled with Diesel fuel.

4

Researches of novel composite pistons for combustion engines

Jankowski A.

Journal of KONES

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2013

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Vol. 20, No. 4

141--146

EN

Novel composite material was worked out based on experiences and researches realized in the Institute of Aviation, the Lodz Technical University and PZL WOLA Company. Actually applied silumins on the pistons secure them high-quality for durability, low Rm and HB values at increased temperature, high hysteresis of the coefficient a during heating and cooling, high clearance between the piston and the cylinder, increased oil consumption, blowthrough and obtainment relatively low-power engine. Thereby works concerning elaborations of novel composite material based on the standard silumin with better from at present applied on the piston properties are presented. Novel composite material on the pistons has mechanical properties in the ambient temperature: Rm ≥ 400 MPa; Rp0.2 ≥ 330 MPa; A5 ≥ 3.5%; HB ≥ 130 and in the temperature 250°C: Rm ≥ 320 MPa; Rp0.2 ≥ 240 MPa; A5 ≥ 5%; HB ≥ 90. Metallographic and ATD researches, the researches of the hardness, the researches of Rm, Rp0.2 and A5, the researches of the coefficient of thermal expansion "α", engine researches were performed. Curves ATD and the microstructure the alloy are presented. Test results of the S12-U diesel engine engine are introduced too.

5

Simulation method of operating parameters assessment used for engine comparative analysis

Kiernicki Z.

Silniki Spalinowe

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2008

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R. 47, nr 1

73-78

EN

The methodology of engine operating parameters assessment that could be used for comparative tests has been presented in the paper. The basic assumption is that the engine is tested during free acceleration. Another assumption of the presented method is that the relative change of parameter could be assessed on the basis of values which are close to exact parameter values. All these parameters are both measured with the same accuracy and under the same conditions. The accuracy of the model has been identified for S-4002 engine. The sample test results have been presented.

PL

W artykule przedstawiono metodykę określania parametrów roboczych silnika przydatnych do badań porównawczych. Podstawowymi założeniami proponowanej symulacyjnej metody określania parametrów są: 1) silnik powinien być badany na biegu luzem podczas gwałtownego rozpędzania, 2) zmiana względna parametru może być oszacowana na podstawie wartości zbliżonych do poziomu wartości bezwzględnych, mierzonych z tą samą dokładnością i w takich samych warunkach pomiaru. Przedstawiono przykładowe wyniki przeprowadzonych testów.