Effect of Cottonseed Trimethylolpropane Ester as Lubricant Oil on Hydrocarbon Emission for Gasoline Engines

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Gulab Siraskar ◽  
Vishnu D. Wakchaure ◽  
Ramchandra S. Jahagirdar
Keyword(s):  
Gasoline Engines ◽  
Lubricant Oil ◽  
Hydrocarbon Emission

Fundamental analysis on auto-ignition condition of a lubricant oil droplet for understanding a mechanism of low-speed pre-ignition in highly charged spark-ignition engines

2018 ◽  
Vol 20 (3) ◽  
pp. 292-303 ◽  
Author(s):  
Mitsuaki Ohtomo ◽  
Tetsunori Suzuoki ◽  
Hiroshi Miyagawa ◽  
Makoto Koike ◽  
Nozomi Yokoo ◽  
...  
Keyword(s):  
Combustion Chamber ◽  
Direct Injection ◽  
Droplet Temperature ◽  
Oil Droplet ◽  
Low Speed ◽  
Gasoline Engines ◽  
Lubricant Oil ◽  
Auto Ignition ◽  
Spark Timing ◽  
Compression And Expansion

This article presents a study of the mechanism that the lubricant oil droplet initiates low-speed pre-ignition in highly boosted downsized gasoline engines. Low-speed pre-ignition is a phenomenon that the fuel–air mixture ignites before the spark timing, leading to flame propagation that results in a heavy knock. The ignition of lubricant oil droplets is thought to be one possible mechanism for low-speed pre-ignition. However, the oil droplet ignition conditions are not yet well understood. First, the conditions under which a single oil droplet initiates the combustion of a fuel–air mixture were investigated using a rapid compression and expansion machine. When an initial droplet temperature was above 250 °C, the vaporized oil ignited before the gasoline–air mixture, in which case the combustion of the gasoline–air mixture around the droplet was initiated. The numerical results showed that the oil droplet temperature increases above 250 °C if the droplet is heated by burned gas remaining in the combustion chamber from the previous cycle. A direct-injection single-cylinder research engine was operated under the condition that no residual gas exists in the combustion chamber. In this case, no low-speed pre-ignition occurred even if gross indicated that mean effective pressure was 2.5 MPa. These results indicate that an oil droplet does not cause low-speed pre-ignition if any droplet flies into the combustion chamber unless it remains in the chamber over the exhaust stroke.

Predicting lubricant oil induced pre-ignition phenomena in modern gasoline engines: The reduced GasLube reaction mechanism

Fuel ◽  
2020 ◽  
Vol 281 ◽  
pp. 118709 ◽  
Author(s):  
E. Distaso ◽  
R. Amirante ◽  
G. Calò ◽  
P. De Palma ◽  
P. Tamburrano ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Gasoline Engines ◽  
Lubricant Oil

Governing Gas and Gasoline Engines

1903 ◽  
Vol 56 (1458supp) ◽  
pp. 23369-23369
Author(s):  
Dugald Clerk
Keyword(s):  
Gasoline Engines

Development of thickened semi-synthetic engine oil M-5z / 20 AERO for four-stroke gasoline engines aircraft piston of unmanned aerial vehicles (UAVs)

2020 ◽  
Vol 06 ◽  
pp. 44-47
Author(s):  
A.A. Moykin ◽  
◽  
A.S. Medzhibovsky ◽  
S.A. Kriushin ◽  
M.V. Seleznev ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Engine Oil ◽  
Motor Oil ◽  
Gasoline Engines ◽  
State Research Institute ◽  
Technical Requirements ◽  
Aerial Vehicles ◽  
State Research ◽  
Industrial Batch ◽  
The Russian Federation

Nowadays, the creation of remotely-piloted aerial vehicles for various purposes is regarded as one of the most relevant and promising trends of aircraft development. FAU "25 State Research Institute of Chemmotology of the Ministry of Defense of the Russian Federation" have studied the operation features of aircraft piston engines and developed technical requirements for motor oil for piston four-stroke UAV engines, as well as a new engine oil M-5z/20 AERO in cooperation with NPP KVALITET, LLC. Based on the complex of qualification tests, the stated operational properties of the experimental-industrial batch of M-5z/20 AERO oil are generally confirmed.

scholarly journals Helarchaeota and co-occurring sulfate-reducing bacteria in subseafloor sediments from the Costa Rica Margin

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Rui Zhao ◽  
Jennifer F. Biddle
Keyword(s):  
Costa Rica ◽  
Metabolic Pathways ◽  
Phylogenetic Analyses ◽  
Sulfate Reducing Bacteria ◽  
Sulfate Reducing ◽  
Hydrocarbon Emission ◽  
Costa Rica Margin ◽  
Reducing Bacteria ◽  
Electron Transfers ◽  
Deep Sediments

AbstractDeep sediments host many archaeal lineages, including the Asgard superphylum which contains lineages predicted to require syntrophic partnerships. Our knowledge about sedimentary archaeal diversity and their metabolic pathways and syntrophic partners is still very limited. We present here new genomes of Helarchaeota and the co-occurring sulfate-reducing bacteria (SRB) recovered from organic-rich sediments off Costa Rica Margin. Phylogenetic analyses revealed three new metagenome-assembled genomes (MAGs) affiliating with Helarchaeota, each of which has three variants of the methyl-CoM reductase-like (MCR-like) complex that may enable them to oxidize short-chain alkanes anaerobically. These Helarchaeota have no multi-heme cytochromes but have Group 3b and Group 3c [NiFe] hydrogenases, and formate dehydrogenase, and therefore have the capacity to transfer the reducing equivalents (in the forms of hydrogen and formate) generated from alkane oxidation to external partners. We also recovered five MAGs of SRB affiliated with the class of Desulfobacteria, two of which showed relative abundances (represented by genome coverages) positively correlated with those of the three Helarchaeota. Genome analysis suggested that these SRB bacteria have the capacity of H2 and formate utilization and could facilitate electron transfers from other organisms by means of these reduced substances. Their co-occurrence and metabolic features suggest that Helarchaeota may metabolize synergistically with some SRB, and together exert an important influence on the carbon cycle by mitigating the hydrocarbon emission from sediments to the overlying ocean.

Numerical investigation of dynamic and hydrodynamic characteristics of the pad in the fluid pivot journal bearing

2021 ◽  
pp. 135065012110330
Author(s):  
Tuyen Vu Nguyen ◽  
Weiguang Li
Keyword(s):  
Computational Models ◽  
Journal Bearing ◽  
Squeeze Film ◽  
Hydrodynamic Characteristics ◽  
Hydrodynamic Properties ◽  
Squeeze Film Damper ◽  
Lubricant Oil ◽  
Oil Flow ◽  
Flow Through ◽  
Bearing System

The dynamic and hydrodynamic properties of the pad in the fluid pivot journal bearing are investigated in this paper. Preload coefficients, recess area, and size gap, which were selected as input parameters to investigate, are important parameters of fluid pivot journal bearing. The pad’s pendulum angle, lubricant oil flow through the gap, and recess pressure which characterizes the squeeze film damper were investigated with different preload coefficients, recess area, and gap sizes. The computational models were established and numerical methods were used to determine the equilibrium position of the shaft-bearing system. Since then, the pendulum angle of the pad, liquid flow, and recess pressure were determined by different eccentricities.

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