{
    "title": "Aquastroke Engine ( Water 70:30 Ethanol )",
    "inventor_name": "Yehuda SHMUELI et al.",
    "publication_year": null,
    "device_name": "AquaStroke",
    "goal": "Enable existing internal-combustion engines to run on a 70 % water / 30 % ethanol (or other water-soluble alcohol) blend, reducing emissions and increasing torque with minimal hardware changes.",
    "problem_addressed": "Reliance on fossil fuels, high carbon, nitrogen- and sulfur-oxide emissions, and the need for a renewable fuel that can be used in existing engine platforms without costly infrastructure changes.",
    "concept_summary": "A modified internal-combustion engine injects a high-pressure water-ethanol (or water-alcohol) mixture into the cylinder. The mixture is compressed to a high pressure, ignited, and the resulting hot gases and steam expansion generate mechanical power. The high water content prolongs cylinder pressure, raising mean effective pressure and torque while suppressing NOx/SOx formation. The system can be adapted to piston, rotary, or jet engines and may include a small on-board hydrogen source (brown-gas) to further enrich the charge.",
    "detailed_description": null,
    "category": "Mechanical Engineering",
    "principles": [
        "Homogeneous Charge Compression Ignition (HCCI)",
        "Multi-stage combustion",
        "High compression ratio operation",
        "Water-fuel heat-absorption effect"
    ],
    "scientific_domains": [
        "Mechanical Engineering",
        "Thermodynamics",
        "Combustion Science"
    ],
    "mechanisms_of_action": [
        "Injection of water-ethanol droplets into the combustion chamber",
        "Compression of the liquid-gas mixture to raise temperature",
        "Ignition by spark plug or high-energy ignition system",
        "Steam expansion adds to piston work"
    ],
    "materials": [
        "Water",
        "Ethanol",
        "Iso-propyl alcohol",
        "Other water-soluble alcohols (iso-butanol, propyl alcohol, etc.)",
        "Acetone",
        "Aldehydes (formaldehyde, acetaldehyde, etc.)"
    ],
    "energy_sources": [
        "Water-ethanol blend (fuel)",
        "Hydrogen (generated on-board via electrolysis, optional)"
    ],
    "inputs": [
        "Water",
        "Ethanol or other alcohol",
        "Air",
        "Hydrogen (optional)",
        "Oxygen (from air or brown-gas generator)"
    ],
    "outputs": [
        "Mechanical power (torque, shaft rotation)",
        "Reduced CO_2, NOx, SOx emissions",
        "Heat and steam"
    ],
    "claimed_performance": "Additional power and torque through multi-stage combustion; significant reduction in carbon footprint; quieter operation; elimination of nitrogen and sulfur oxide emissions.",
    "experimental_evidence": "The inventors built a prototype by modifying a 400 cc off-the-shelf diesel engine and operated it with a 70 % water / 30 % iso-propyl-alcohol fuel at injection pressures up to 2000 psi. No quantitative performance data were provided.",
    "replication_status": "Prototype demonstrated; no independent replication reported.",
    "keywords": [
        "wet-alcohol fuel",
        "hydrogen-oxygen (brown gas)",
        "HCCI",
        "water-ethanol engine",
        "alternative fuel",
        "low-emission combustion"
    ],
    "related_technologies": [
        "Homogeneous Charge Compression Ignition (HCCI) systems",
        "Brown-gas (HHO) generators",
        "High-pressure fuel injection"
    ],
    "controversy_level": "medium",
    "confidence_score": 0.78,
    "practicability_score": 0.62,
    "fringe_score": 0.38,
    "evidence_strength": 0.28,
    "risk_score": 0.18,
    "trl_estimate": 4,
    "source_urls": [
        "http://rexresearch.com/",
        "http://rexresearch1.com/",
        "https://maymaan.com/technology/",
        "https://maymaan.com/technology/"
    ],
    "organizations": [
        "Maymaan"
    ],
    "applications": [
        "Power generators (20 kW - 120 kW)",
        "Automotive engines",
        "Marine propulsion",
        "Industrial diesel-type engines"
    ],
    "limitations": [
        "Requires high-pressure fuel injection system",
        "Hydrogen generation (brown-gas) adds complexity",
        "No published quantitative efficiency or emissions data",
        "Potential corrosion from water-rich fuel"
    ],
    "open_questions": [
        "What is the net energy balance when accounting for on-board hydrogen electrolysis?",
        "How does long-term engine durability compare with conventional diesel/gasoline operation?",
        "What are the exact emission reductions under standardized test cycles?",
        "Can the system be scaled to larger power ratings without loss of efficiency?"
    ],
    "red_flags": [
        "Claims of \"significant reduction\" in emissions without supporting measurements",
        "Reliance on a proprietary hydrogen-generation method that is not described in detail",
        "No independent third-party testing reported"
    ],
    "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 include alcohol, acetone, aldehyde and other similar, preferably non-fossil substances.",
        "The fuel 42 from the fuel tank 40 is provided to the fuel injector 48 by pump 43 at a pressure in the range of 200-3,000 PSI. In one embodiment, the fuel is injected at a pressure of about 2000 PSI.",
        "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 ..."
    ]
}