Transfer-Expansion Heat Engine Regenerative Combustion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Reciprocating internal combustion heat engines suffer from high energy losses due to heat emitted in exhaust, cooling systems, friction, and pumping losses, with inefficiencies stemming from design limitations such as temperature disparities within the engine, sequential combustion phases, and sensitivity to compression ratios and turbulence, leading to low thermodynamic efficiency and increased pollutant production.
Innovation Solution
A heat engine with transfer-expansion and regeneration separates intake-compression, combustion, and expansion-exhaust phases into dedicated components, utilizing a high-temperature expansion cylinder with advanced sealing to minimize heat losses, and employs a regenerative system to recycle residual heat, allowing for continuous combustion and reduced dependence on flame propagation, thus optimizing energy conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal walls of the engine are cooled to maintain acceptable operating temperatures, then the lubrication oil temperature is maintained at acceptable levels and detonation is prevented, but significant energy is lost through the cooling system
Solution Approach 1:
The patent recovers waste heat from exhaust gases and uses it to preheat the intake charge and/or coolant. The exhaust heat exchanger transfers thermal energy from hot exhaust gases to the incoming air-fuel mixture or cooling fluid, converting what would be wasted energy into a useful resource for maintaining optimal operating temperatures without additional cooling energy loss.
2Productivity
If fresh gases are excessively heated during intake to increase mass flow, then more power can be generated, but the charge becomes susceptible to detonation and combustion efficiency deteriorates
Solution Approach 1:
The patent dynamically adjusts the temperature of the intake charge by controlling the heating process in the intake manifold. By precisely managing the thermal state of the fresh gases, the system optimizes the balance between mass flow rate and combustion stability, preventing both overheating-induced detonation and excessive cooling that would reduce power output.
3Device complexity
If all combustion phases occur in the same chamber sequentially, then the engine structure remains simple, but heat losses increase and combustion efficiency decreases
Solution Approach 1:
The patent divides the combustion process into separate functional zones within the combustion chamber. The pre-combustion chamber handles initial ignition and flame development, while the main combustion chamber handles the primary combustion event. This segmentation allows each zone to be optimized for its specific function, improving overall combustion efficiency and reducing heat losses while maintaining a relatively simple overall structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves higher efficiency in converting heat to work, reduces fuel consumption, and lowers emissions by minimizing heat losses and optimizing combustion conditions, resulting in improved performance across a wider power range with reduced acoustic and vibration emissions.
Implementation Method 1
a regenerative system to recycle residual heat
Implementation Method 2
expansion cylinder with advanced sealing to minimize heat losses
Implementation Method 3
combustion and then the expansion of said gases take place
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The transfer - expansion - regeneration combustion engine (1) comprises a compressor (2) which delivers gases into a high-pressure regeneration pipe (6) of a regeneration heat exchanger (5) from which pipe the gases emerge preheated via a regenerator high-pressure outlet pipe (9) which comprises a heat source (12) which superheats said gases, the latter then being transferred by an intake metering valve (24) operated by a metering valve actuator (25) to a transfer - expansion chamber (16) notably formed by an expansion cylinder (13) and an expansion piston (15), said gases re-emerging from said chamber (16) having been expanded via an expanded-gases exhaust pipe (26) and via an exhaust valve (31) operated by an exhaust-valve actuator (32) before being cooled in a regeneration low-pressure pipe (7) that the regeneration heat exchanger (5) comprises.