Coopal Power is a specialist in providing dependable power solutions from engines, such as high quality diesel generators and authentic parts from top brands like Cummins and Deutz. Our activities are at the heart of the study of combustion in ICs (internal combustion engines). This process transforms chemical energy into mechanical energy that can be utilized in mechanical devices, vehicles, industrial machinery and generators. Whether you’re a fan of backup power or an optimiser of energy solutions, the principles of combustion will help you understand its importance and also give you an insight into the principles of strong and efficient engines.
What is Combustion in IC Engine?
In an IC engine, combustion can also be referred to as combustion internal engine processes, is a fast chemical process in which fuel (usually gasoline, diesel, or natural gas) undergoes reaction with an oxidizer (usually air) in a combustion chamber of the engine. This is an exothermic reaction that gives out heat and generates high pressure gases which expand to do work.
IC engines combine combustion into the engine whereas external combustion engines (such as steam engines) do not. This direct approach introduces the benefits of being compact, powerful, and responsive, which are beneficial to power generation applications where Coopal Power can be found all over the world.
The conditions for combustion are:
- Fuel: Hydrocarbon based liquids or gases.
- Oxygen: From air (approx. 21% Oxygen).
- Ignition source: Spark (in SI engines) or high compression (in CI engines).
- Volatile: Easily ignitable.
Proper combustion is the process of complete combustion, the energy released is maximized and unwanted by products are minimized.
A Four-Stroke Cycle where Combustion Happens
Spark-ignition and compression-ignition engines (commonly known as Otto cycle and Diesel cycle engines, respectively) use the four-stroke cycle, which is prevalent in most of the modern IC engines, particularly the ones supplied by Coopal Power for generators. What’s combustion got to do with it:
- Intake Stroke: The piston decreases in elevation drawing air (diesel) or air-fuel mixture (gasoline) into the combustion chamber through the opened intake valves.
- Compression Stroke: Valves are closed, the piston moves up and the charge is compressed. This increases the temperature and pressure considerably, which is important for achieving good combustion. Usually, the compression ratio of gasoline engines is 8:1 to 12:1, while diesel engines have a ratio of 14:1 to 25:1.
- Power (Combustion) Stroke: This is the power generating portion of the process. A point very close to top dead center (TDC):
- A spark plug ignites the mixture, resulting in a flame front which propagates through the chamber in a spark-ignition (SI) engine.
- As for compression-ignition (CI) engines (which are commonly used in Coopal Power’s diesel generators) fuel is injected into hot compressed air where it auto-ignites. Combustion is a process that takes place in stages: ignition delay, premixed combustion, and diffusion combustion.
Power is generated when gases are expanded, pushing the piston down. This stroke is used to transform the thermal energy into mechanical energy.
- Exhaust Stroke: The piston goes up again and the combustion products are pushed out of the engine through the exhaust valves.
It takes 720° (2 full crankshifts) to complete the cycle. Fuel burning must occur at an exact time so that it may be optimized, otherwise, it will knock if it is burned too soon, or lose energy if it is burned too late.
Types of Combustion in IC Engines
Combustion is different for each type of engine:
- Spark Ignition (SI) Engines: Homogeneous charge which is mixed in advance. Flame-propagation is controlled by combustion. Knock sensitive, thus high octane fuels are required.
- Compression Ignition (CI) Engines: Heterogeneous charge – This refers to the compression ignition engines that require heterogeneous charge. Fuel is pumped under high pressure which results in stratified combustion. More efficient thermally but may generate higher levels of particulates if not managed properly.
Some of the most advanced techniques, such as the Homogeneous Charge Compression Ignition (HCCI) or Low Temperature Combustion (LTC), combine the advantages of both methods and offer the potential for increased efficiency and reduced emissions. They are zones of continuous innovation and are congruent with Coopal Power’s commitment to future-proof power solutions.
The combustion efficiency is influenced by a variety of factors:
There are a number of factors involved in determining efficiency in combustion internal engine systems:
- Stoichiometric (ideal for complete combustion) Air-Fuel Ratio (AFR): For gasoline: 14.7:1, For diesel: 14.5:1. Lean mixtures are more efficient, but can misfire; rich mixtures are more powerful, but are more polluting.
- Compression Ratio: Higher compression ratios are more efficient thermodynamically (by the formulas of the Otto/Diesel cycles) however material strength and knock limit compression ratios.
- Combustion Chamber Design: Shapes influence the turbulence, the flame speed and heat losses. Flow is optimized by design, such as hemispherical, pent-roof chambers. The engines that are partnered with Coopal Power are an advanced series that has enhanced mixing and has lower emissions.
- Ignition and Injection Timing: In today’s engines, Electronic controls modify these in real-time according to load, speed and temperature.
- Turbulence and Swirl: Air movement is created by the design of the engine for quicker and more complete fire.
In real engines, which have efficiency of 30-45%, diesels (higher in the case of large stationary engines) are much lower than theoretical Carnot limits, because of heat loss, friction, and incomplete combustion. Coopal Power’s focus is on engines that continue to advance them for economical power generation.
Tasks in the section Emissions and Environmental Impact.
During combustion, as well as power, pollutants are also produced:
- NOx: At high temperatures.
- CO and HC: Due to incomplete combustion.
- Particulates (soot): Particularly in the case of diesels.
- CO2: An inevitable by-product of hydrocarbon fuels.
Advanced after-treatment solutions include Diesel Oxidation Catalysts (DOC), Selective Catalytic Reduction (SCR) with DEF, Diesel Particulate Filters (DPF) and Exhaust Gas Recirculation (EGR) which are supported by Coopal Power. With optimized combustion these technologies contribute to achieving the strictest emission limits and reliability.
Advances in Combustion Technology:
The industry keeps on changing:
- Direct Injection: Accurate fuel injection for improved atomisation.
- Turbocharging and Variable Geometry: More air for efficient burning.
- Real-time Optimization (RTO): Electronic Control Units (ECUs).
- Alternative Fuel: lower carbon footprint as a result of using Biodiesel, natural gas, or hydrogen blends.
- Hybrid Integration: Hybrid Engine Combination of IC and Electric Systems for Optimum Performance.
These advances are engineered into engines we use and recommend to our clients, providing them with reliable, high performance engines for standby, prime or continuous use.
How the combustion master equation works for power generation.
Stable voltage, rapid load response and fuel economy are the hallmarks of a reliable combustion, in generator sets. Bad burning results in downtime, operating cost increases and environmental non-compliance. Coopal Power has the experience to provide the Cummins and Deutz engines the best results; true parts are used and expert assistance is provided to ensure maximum combustion performance over years of use.
We have a multilingual team and engineers to help our clients with selection, installation and maintenance of systems to meet their needs, all over the world, whether at a remote site or in a data center, hospital or industrial facility.
Conclusion: The Future of IC Engine Combustion.
Combustion in IC engines continues to be one of the key pillars of world wide energy infrastructure. Electrification is increasing, but IC engines, particularly well-designed diesel engines, will provide power for a long time to come in critical applications. With new materials, controls and combustion strategies, efficiency is continually improved, emissions lowered, and reliability increased.
At Coopal Power, we are committed to providing top-tier engine power solutions that harness the best of this technology. Our focus on quality, innovation, and customer success positions us as a trusted partner in reliable power.
Whether you’re upgrading your power setup or seeking expert advice on maintaining optimal combustion, contact Coopal Power today. Let’s power your world efficiently and sustainably.