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Irregularity of static working states of ship combustion piston engine

100%

Chlopek Z. , Piaseczny L.

Polish Maritime Research

2006

tom 13

nr 2

Variability of static working conditions of combustion engine in the range of higher frequencies has character of noise resulting from phenomena not taken directly into account in test program as well as from features of measuring systems. Knowledge of features of the noise contained in observed static signals is important for determining the representative values taken as static and slow-changeable in conditions of unavoidable disturbances. The tests in question were carried out in the static working conditions of a 6AL 20/24 Sulzer diesel engine, determined by the torque Me = 4.33 kNm and the rotational speed n = 660 min–1. The follo-wing quantities characterizing emission of pollutants contained in exhaust gas in the conditions described by the engine working point : torque, rotational speed and concentrations of carbon oxide, hydrocarbons and nitrogen oxides, were selected for analyses. The tests were performed in the domains of time, process values and frequency. It was stated that the observed runs of the noise generated by phenomena not directly accounted for in combustion engine static test program and by measuring systems, had mainly the character of uncorrelated broad-band normal noise. The results justify a.o. correctness of averaging the measurement results obtained in static conditions as well as synchronous averaging in steady conditions

Statistical investigations of fast changeable processes occurring in ship pieton combustion engine

100%

Chlopek Z. , Piaseczny L.

Polish Maritime Research

2005

tom 12

nr 2

Combustion piston engine is one of the devices in which fast changeable processes occur in operationalconditions. In this paper are presented basic problems associated with research on fast changeable processes occurring in diesel engines , exemplified by the processes of indicated pressure and fuel pressure injected to engine's cylinder. Dynamical characteristics of the investigated processes were analyzed and problems of synchronous averaging of pseudo-periodical signals were considered in order to limit high frequency noise content in useful signal. Some limitations of elimination effectiveness of high frequency noisefrom tested signals have been revealed

The influence of metalloorganic fuel additives on CI engine emission

80%

Chlopek Z. , Darkowski A. , Piaseczny L.

Polish Journal of Environmental Studies

2005

tom 14

nr 5

The emission of particulates besides the emission of nitrogen oxides is one of the most serious problems of ecological CI engines. One means of particulates abatement is by applying catalytic additives to fuel. It suppresses particulate formation intensity and promotes the oxidation of particulates in filters. The results of influence of fuel additives (with organic magnesium) on pollution emission were presented. The studies were carried out on a Sulzer 6AL20/24 CI engine. The assessment of influence of catalytic additives to fuel on pollution was done on the basis of mathematical model analysis of the engine. It was identified that elementary emission of particulates in range of additive content lower than 0.05% is a decreasing function, and maximum abatement of emission in the considered range of engine speed and torque is about 70%, which was recognized as a very promising result.