INFLUENCE OF INJECTOR OPENING PRESSURE ON EXHAUST EMISSIONS IN DI DIESEL ENGINE WITH THREE LEVELS OF INSULATION WITH DIESEL OPERATION

ABSTRACT Experiments were conducted to study exhaust emissions of direct injection (DI) diesel engine with different levels of low heat rejection (LHR) combustion chamber such as i) ceramic coated cylinder head, ii) air gap insulated piston and air gap insulated liner and iii) ceramic coated cylinder head along with air gap insulation with pure diesel operation with varied injector opening pressure. Exhaust emissions of particulate emissions and oxides of nitrogen (NO x ) were determined at various values of brake mean effective pressure (BMEP) of the engine. Particulate emissions were measured by AVL Smoke meter, while NO x by Netel Chromatograph NO x analyzer. Engine with different versions of the combustion chamber showed comparable particulate emissions, while they increased NO x emissions drastically at full load operation of the engine, when compared with conventional engine. Engine with air gap insulated piston and air gap insulated liner showed lower NO x levels at 80% of the full load operation. However, exhaust emissions reduced with an increase of injector opening pressure with different versions of the combustion chamber

Biological parameters and thermal requirements of Trichogramma chilonis reared on Corcyra cephalonica and Plutella xylostella eggs

The objective of this work was to determine the biological parameters and thermal requirements of Trichogramma chilonis strain reared on Corcyra cephalonica and Plutella xylostella eggs at College of Agriculture, CAU, Imphal, Manipur. The optimum temperature for the parasitism and emergence of T. chilonis was 25°C and the utmost longevity was found at the same temperature. Maximum parasitism was observed 84.14 and 82.71 per cent at 25°C, while minimum parasitism was 76.57 and 69.14 per cent at 20°C on C. cephalonica and P. xylostella eggs, respectively. The results indicate that temperature has a significant effect on the biological parameters of T. chilonis and with increasing temperature developmental duration decreased in laboratory condition of Manipur. On the basis of the present results Corcyra cephalonica eggs was more suitable for mass production of T.  chilonis than P. xylostella under controlled conditions