{
    "title": "Aquastroke Engine (Water 70:30 Ethanol)",
    "inventor_name": "Yehuda SHMUELI",
    "publication_year": null,
    "device_name": "AquaStroke Engine",
    "goal": "Enable internal combustion engines to run on a sustainable 70 % water / 30 % ethanol (or other alcohol) mix, reducing emissions while increasing power and torque with minimal changes to existing engine infrastructure.",
    "problem_addressed": "Dependence on fossil fuels, high carbon, nitrogen and sulfur oxide emissions, and the need for a renewable fuel compatible with existing internal combustion engines.",
    "concept_summary": "The AquaStroke engine injects a high-pressure water-alcohol mixture (typically 70 % water, 30 % isopropyl alcohol) into a conventional combustion chamber, optionally enriched with a small amount of hydrogen/oxygen (brown-gas). The mixture is compressed to a high pressure, raising temperature and extending the pressure pulse, which increases mean effective pressure (IMEP) and torque. The system uses a high-compression ratio and a conventional spark-ignition system, allowing the engine to run on a non-fossil wet fuel while eliminating NOx and SOx emissions.",
    "detailed_description": null,
    "category": "Mechanical Engineering",
    "principles": [
        "Homogeneous Charge Compression Ignition (HCCI)",
        "Multi-stage combustion",
        "High compression ratio",
        "Wet-fuel (water-alcohol) injection",
        "Hydrogen/oxygen enrichment (brown-gas)",
        "Extended pressure pulse for higher BMEP"
    ],
    "scientific_domains": [
        "Combustion Engineering",
        "Thermodynamics",
        "Mechanical Engineering",
        "Chemical Engineering"
    ],
    "mechanisms_of_action": [
        "Injection of water-alcohol droplets into the cylinder",
        "Compression heating of the liquid-gas mixture",
        "Spark ignition of the compressed mixture",
        "Hydrogen/oxygen addition to increase flame speed",
        "Prolonged high-pressure phase to raise torque"
    ],
    "materials": [
        "Water",
        "Ethanol",
        "Isopropyl alcohol",
        "Other alcohols (iso-butanol, propyl alcohol, butyl alcohol, ethyl alcohol, methyl alcohol)",
        "Acetone",
        "Aldehydes (formaldehyde, acetaldehyde, butyraldehyde, etc.)",
        "Hydrogen gas",
        "Oxygen gas",
        "Air"
    ],
    "energy_sources": [
        "Chemical energy of water-alcohol fuel",
        "Hydrogen generated by on-board electrolysis (brown-gas)"
    ],
    "inputs": [
        "70 % water / 30 % ethanol (or other alcohol) fuel mixture",
        "Hydrogen/oxygen gas (optional)",
        "Ambient air",
        "Electrical energy for spark ignition and controller"
    ],
    "outputs": [
        "Mechanical power (shaft torque and rotation)",
        "Heat",
        "Steam and reduced-emission exhaust gases",
        "Lower NOx and SOx emissions"
    ],
    "claimed_performance": "Increases torque via higher Brake Mean Effective Pressure (BMEP); runs on 70 % water / 30 % ethanol mix; eliminates nitrogen and sulfur oxide emissions; operates quieter than traditional engines; power generator versions of 20 kW, 35 kW and 120 kW reported.",
    "experimental_evidence": "A prototype was built by modifying a generic 400 cc Diesel engine; qualitative observations reported higher torque and reduced emissions, but no quantitative performance data were provided.",
    "replication_status": null,
    "keywords": [
        "wet fuel",
        "water-alcohol engine",
        "hydrogen enrichment",
        "HCCI",
        "alternative fuel",
        "emission reduction"
    ],
    "related_technologies": [
        "Homogeneous Charge Compression Ignition (HCCI) engines",
        "Brown-gas (HHO) generators",
        "Alternative fuel injection systems",
        "High-compression diesel engines"
    ],
    "controversy_level": "medium",
    "confidence_score": 0.73,
    "practicability_score": 0.62,
    "fringe_score": 0.38,
    "evidence_strength": 0.45,
    "risk_score": 0.22,
    "trl_estimate": 4,
    "source_urls": [
        "http://rexresearch.com/",
        "http://rexresearch1.com/",
        "https://maymaan.com/technology/",
        "US11879401Shmueli.pdf",
        "US2016222878Shmueli.pdf"
    ],
    "organizations": [
        "Maymaan"
    ],
    "applications": [
        "Stationary power generators",
        "Vehicle propulsion (automotive, marine, aviation)",
        "Hybrid power-train retrofits"
    ],
    "limitations": [
        "Requires high-pressure fuel injection (200-3000 psi)",
        "Dependence on on-board hydrogen generation (electrolysis) which consumes electrical energy",
        "Potential lower overall efficiency compared to optimized fossil-fuel engines",
        "Lack of published quantitative performance data"
    ],
    "open_questions": [
        "What is the net energy balance when accounting for hydrogen production?",
        "How does long-term durability of engine components respond to continuous wet-fuel operation?",
        "What are the exact emission reductions (NOx, CO_2, particulates) measured under standardized test cycles?",
        "Can the technology be scaled to high-power automotive or marine applications without loss of efficiency?"
    ],
    "red_flags": [
        "Claims of emission elimination without supporting test data",
        "Potential under-estimation of the energy cost for on-board electrolysis",
        "No independent third-party verification of performance"
    ],
    "evidence_quotes": [
        "The engine 100 further includes a hydrogen source 20. In one embodiment, source 20 is implemented as a reactor that generates a stoichiometric H2/O2 gas mixture (brown gas) from water using electrolysis process.",
        "The fuel in the fuel tank consists essentially of water and a flammable substance soluble in water. ... the flammable substance may be an alcohol selected from iso-propyl alcohol, iso-butanol, propyl alcohol, butyl alcohol, ethyl alcohol, methyl alcohol or a mixture of such alcohols.",
        "The concentration of the flammable material can be in the range of 5-40%, and preferably 10-35%. The inventors have found that, in particular a mixture of about 70% water to 30% isopropyl alcohol is particularly advantageous.",
        "The engine 100 operates at a very high compression ratio. Typically, a conventional combustion engine operates at a compression ratio of around 15/1 to 18/1, except ..."
    ]
}