Effect of direct water injection during compression stroke on thermal efficiency optimization of common rail diesel engine

Gaseous fuels are good alternative fuels to improve the energy crisis of today’s situation due to its clean burning characteristics. However, the incidence of backfire and knock remains a significant barrier in commercialization. With the invention of latest technology, the above barriers are eliminated. One such technique is timed injection of water into the intake port. In the present investigation, acetylene was aspirated in the intake manifold of a single cylinder diesel engine, with a gas flow rate of 390 g/h, along with water injected in the intake port, to overcome the backfire and knock problems in gaseous dual fuel engine. The brake thermal efficiency and emissions such as NOx, smoke, CO, HC, CO2 and exhaust gas temperature were studied. Dual fuel operation of acetylene induction with injection of water results in lowered NOx emissions with complete elimination of backfire and knock at the expense of brake thermal efficiency.

Download Full-text

Emissions from large-scale medium-speed diesel engines: 3. Influence of direct water injection and common rail

Fuel Processing Technology ◽

10.1016/j.fuproc.2008.09.003 ◽

2009 ◽

Vol 90 (2) ◽

pp. 222-231 ◽

Cited By ~ 40

Author(s):

Arto Sarvi ◽

Pia Kilpinen ◽

Ron Zevenhoven

Keyword(s):

Diesel Engines ◽

Large Scale ◽

Water Injection ◽

Common Rail ◽

Direct Water Injection ◽

Medium Speed

Download Full-text

Effect of Water Injection on Emission Characteristics of a Turbocharged Diesel Engine

ASME 2009 Internal Combustion Engine Division Spring Technical Conference ◽

10.1115/ices2009-76025 ◽

2009 ◽

Cited By ~ 1

Author(s):

R. K. Sullerey ◽

Ankur Agarwal

Keyword(s):

Nitrous Oxide ◽

Diesel Engine ◽

Water Injection ◽

Nitrous Oxide Emissions ◽

Small Scale ◽

Common Source ◽

Low Carbon ◽

Direct Water Injection ◽

A Minor ◽

Humidified Air

The diesel engine is a very common source of small-scale power generation. While diesel engines are efficient with low carbon monoxide and hydrocarbon emissions, they have high nitrous oxide emissions. One approach to reduce the formation of nitrous oxides is by introducing water in the diesel engine system. The present paper is a study of effects on performance of direct water injection in the cylinder during the compression stroke and humidifying air prior to its entry to the engine by use of suitable models for various processes. It is observed that nitrous oxide concentrations are substantially reduced by both direct water injection as well as by use of humidified air. Use of humid air however also increases the power output of the engine with a minor loss in efficiency.

Download Full-text

Experimental Study of Inlet Manifold Water Injection on a Common Rail HSDI Automobile Diesel Engine, Compared to EGR with Respect to PM and Nox Emissions and Specific Consumption

10.4271/2009-01-1439 ◽

2009 ◽

Cited By ~ 14

Author(s):

Samiur Rahman Shah ◽

Alain Maiboom ◽

Xavier Tauzia ◽

Jean-Francois Hetet

Keyword(s):

Experimental Study ◽

Diesel Engine ◽

Water Injection ◽

Common Rail ◽

Specific Consumption ◽

Nox Emissions ◽

Inlet Manifold

Download Full-text

Exhaust gas heat recovery through secondary expansion cylinder and water injection in an internal combustion engine

Thermal Science ◽

10.2298/tsci150915282n ◽

2017 ◽

Vol 21 (1 Part B) ◽

pp. 729-743

Author(s):

Toosi Nassiri ◽

Amir Kakaee ◽

Hazhir Ebne-Abbasi

Keyword(s):

Internal Combustion Engine ◽

Thermal Efficiency ◽

Combustion Engine ◽

Water Injection ◽

Internal Combustion ◽

Exhaust Gas ◽

Exhaust Gases ◽

Injection Process ◽

Direct Water Injection ◽

Novel Concept

To enhance thermal efficiency and increase performance of an internal combustion engine, a novel concept of coupling a conventional engine with a secondary 4-stroke cylinder and direct water injection process is proposed. The burned gases after working in a traditional 4-stroke combustion cylinder are transferred to a secondary cylinder and expanded even more. After re-compression of the exhaust gases, pre-heated water is injected at top dead center. The evaporation of injected water not only recovers heat from exhaust gases, but also increases the mass of working gas inside the cylinder, therefore improves the overall thermal efficiency. A 0-D/1-D model is used to numerically simulate the idea. The simulations outputs showed that the bottoming cycle will be more efficient at higher engines speeds, specifically in a supercharged/turbocharged engine, which have higher exhaust gas pressure that can reproduce more positive work. In the modeled supercharged engine, results showed that brake thermal efficiency can be improved by about 17%, and brake power by about 17.4%.

Download Full-text