Thursday, March 27, 2008

Image:New Rotary Engine.jpg - Wikimedia Commons

Image:New Rotary Engine.jpg - Wikimedia Commons

Sunday, October 7, 2007

Perfectly Utilized Rotor

videoMy site was nominated for Best Geek Blog!

Area-contact Seal Rotary Engine

Problems to be solved:

1. To eliminate the common weaknesses of conventional engines whether reciprocating, rotary, internal combustion, external combustion, gas-turbine, diesel, or Otto types.
2. To gain superiority of advantages when compared to the advantages of conventional engines.
3. To gain other exceptional advantages which are absent in any of the conventional engines.

Enumeration of eliminated common weaknesses of typical engines:
1. Of reciprocating engines:
a. More moving parts
b. Acceleration and deceleration of large masses
c. Complicated valve mechanisms

d. Slowest speed of all types
e. Heaviest and bulkiest of all types
f. Lowest volumetric efficiency
g. Need of batteries and/or cranking motors at large capacity types
2. Of Wankel rotary engines:
a. Very leaky working chambers
b. Highest maintenance of seals
c. Lowest compression ratio
d. Lowest fuel economy and thermodynamic efficiency
e. Greatest surface area and heat loss of combustion chambers
f. Very irregular epitrochoid-housing shape
g. Necessity of synchronizing gear and bearings on the rotor
h. Worst distortion caused by uneven thermal distribution
i. Most polluting of all types
j. Very limited to costly, volatile, and flammable fuels
3. Of internal combustion engines:
a. Costly device for fuel introduction:
· precision common-rail injectors
· throttled intake by bulky carburetors
b. Lack of waste heat recovery apparatus
c. Vibration by intermittent instantaneous combustion pressures
4. Of external combustion engines:
a. Non-portability
b. Bulky heat exchangers and combustion chambers
c. Mostly with stationary and localized structure for huge capacity types
5. Of gas turbine engines:
a. Very expensive rotor blades and most complex and expensive frame
b. Most inefficient thermodynamic cycle
c. Least fuel economy at low-speed operation
d. High maintenance cost of blade replacement
e. Necessity of bulky reduction gears for high torque conversion
f. Very inefficient low operating-combustion temperature
g. Less agility of transport vehicle use due to gyroscopic effect
6. Of diesel engines:
a. Disadvantages of reciprocating parts
b. Very bulky and heavy construction due to more parts subjected to high pressures
c. Expensive fuel injector that is sensitive to abrasive particles

d. More surfaces subjected to carbon deposit
e. Most polluting when not properly maintained
7. Of Otto/gasoline engines:
a. Disadvantages of reciprocating parts
b. Most inefficient compression ratio attained
c. Very less volumetric efficiency due to displacement caused by vaporized fuel
d. Ignition most likely to foul at numerous conditions
e. Very inefficient throttling especially at higher speed
f. Needs dangerously flammable fuels to be stored safely
g. Very expensive maintenance due to more intricate electronics

h. Very susceptible to failure at freezing conditions

Superiority of Advantages in comparison to conventional engines:
1. Reciprocating engines:
a. Far greater turbocharging effect with much shorter air manifold placed in the rotor side due to induced centrifugal action of the rotor to the intake air and the expanding exhaust gas
b. More tighter seal due to tighter clearances due to even thermal distribution
c. Better lubricated seal due to cycling of oil around the housing chambers with no ports
d. Lower attainable RPM due to tighter seal
e. More even seal wear due to wider surface contact and lesser contact pressure
f. Very less vibration imparted by moving parts due to greater hydrodynamic lubrication
g. More complete expansion due to dedicated tight expansion chamber
h. More leveled torque output than multi-cylinder types due to more cycles per shaft turn
i. No special fabrication toolings required
2. Wankel rotary engines:
a. More effective rotor for the added chambers due to elimination of gears and bearings
b. Lesser overall centrifugal force due to inherent opposing centrifugal forces
c. Higher attainable RPM due to area-contact seal effecting hydrodynamic action of oil
d. More dynamic transfer ports located in the rotor aided by imparted centrifugal action
e. Lesser cost to manufacture due to added regularity of the chamber shapes
f. Lesser vibration due to lesser rotor mass by the elimination of gears and bearings
g. More compact package due to added higher efficiency attained
h. Much cheaper to be made into ceramics due to much smaller package
i. More independent on cranking motors at higher capacity types in favor of compressed gas
3. Internal combustion engines:
a. Much greater portability due to elimination of bulky conventional fuel system
b. Much compact that it can effectively use dedicated compression and expansion chambers
4. External combustion engines
a. More rigid and compact heat exchanger due to intimacy of air manifolds at the rotors
b. Far more effective and still cheap fuel delivery due to simple inherent air injector
c. Very effective steam power generation by using only the air injector mentioned above
d. Simplest exhaust condenser by the use of rotor cavities subjected to centrifugal force
e. Simplest water separator in the form of rotor cavities
5. Gas turbine engines:
a. Lesser secondary gas ingestion due to added advantage of lower excess air intake aside from inherent opposing intake and exhaust ports without unnecessary long manifolds
b. Far more lighter construction due to accumulated advantages and superior efficiency
c. Has better output shaft performance in equivalent RPM due to higher shaft torque
d. Greater speeds without the danger of cavitation and for lesser mass subjected to centrifugal force
e. Far more advantageous for aviation due to more adaptability for ducted fan propulsion
f. Much lower vibration due to superior compact package in comparable horsepower
g. Much quieter operation due to far lesser air intake and gas exhaust
h. Far greater multi-fuel range due to higher compression ratio
6. Diesel engines:
a. Much cheaper bunker fuel due to greater tolerance of air injector to abrasive particles
b. Much higher compression ratio attained for higher efficiency due to inherent simple heat exchanger using rotor cavities
c. Far higher and flatter shaft torque due to multiple hybrid cycle per shaft rotation
d. Far more rigid due to added compactness aside from having thicker walls
e. Far greater multi-fuel range due to dedicated combustion and expansion chambers
7. Otto/gasoline engines:
a. More efficient and sustainable higher peak ignition pressure due to pre-chamber closed to compression chamber and open to expansion chamber by use of simple needle valves
b. Much effective and cheaper fuel delivery by use of simple inherent air injector
c. Far more lighter even in diesel-type of operation with thicker walls due to compactness
d. Cleaner in operation due to continuous wiping and filtering of oil in expansion chambers

Other exceptional advantages of this simple rotor configuration:
1. By far simpler and cheaper to mass produce
2. Very sturdy in construction and safer in operation by the use of pre-chambers
3. Very light and small of equivalent horsepower (Less than 1/10th the size of reciprocating engines if of equivalent volume of normally-aspirated intake air, equivalent speed, and same thermodynamic cycle)
4. Excellent regenerative braking by effective air compression storage with its very compact compressor and superbly high pressure attained in storage tanks

see my design-contest entry sponsored by NASA Tech Briefs:
http://www.createthefuturecontest.com/pages/view/entriesdetail.html?entryID=766
video

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Saturday, October 6, 2007

Simplest Engine Revealed

W HO WANTS TO FLY
by Julius C. Siador
rotaryenginephilippines@yahoo.com
Who wants a much wider free space to explore? In parallel thought, a kid may straightforwardly ask: “Can I fly real close to the sun?” We watched migrating birds crossed boundaries, yet we often join in with old folks kidding on gullible kindergartners with folklore like Daedalus myth, then scoff at the innate child in us.
Well, not everyone really since, at least, I am one visionary of a personal satiating flight with jet packs, surpassing the raven’s agility! Will you join in with me to this unique “Mission Impossible: Nevermore”? Do you wish to appreciate such science and technology behind? “Only this and nothing more.” I reckon your fanciful thoughts as my dear pupils on this seemingly fanciful ultimate quest of man—although insignificant to the moment when those who wait on the Lord will find new strength, will fly high on wings like eagles, will run and not grow weary, will walk and not faint…

What is this personal jet-powered prolonged flight? Wasn’t Buck Rogers already worn out from enjoying that? Will it be just reinventing if you try to build such craft? Or, is there anything wanting yet? Well, definitely, there is, and more!—for one, the lack of enough duration to appreciate the freedom of flight exploration: that kid stuff for real acrobats. Now, follow me to reinvent “that cuttlefish” to adapt our thin atmosphere!

What were those props strapped on jet plane’s wings? Can we remodel that and strap ourselves to such? Well, that is impractical, unless I share you some secrets. Letting it be very lightweight and powerful was already exhausted long before. But, letting it be extremely efficient and cheap is the defining key not revealed by everyone. Well, not everyone really since, at least, I am one engineer who delve into our future, then willingly unveil the key design to do such requisite. Would you be, as disciples, eager to learn the pioneering craft? Do you wish to be great engineers for a moment if you are truly enthusiasts? “Merely this and nothing more.” I reckon your burning hearts as my dear apprentices on this seemingly whimsical engine propulsion of the future—although found wanting in comparison to the majestic wings of a cunning owl.

Dear friends, that craft must have a ROTARY ENGINE. Oops, not that gas-turbine/jet engine! It’s neither a rotating-cylinders engine, nor a rocket engine. How about Wankel of Mazda? Well, the brainchild of Felix Wankel that was simply derived from John Cooley’s engine is so brilliant for aeronautics, but far from being near enough—even its appropriately hyped futuristic Mazda RX-8 Renesis Ceramic Hydrogen Engine I will render obsolete later. Too bizarre to most engineers, I even propose that it is of Diesel Cycle… Expert aeronautical engineers who know Bryton Cycle too well would surely dismiss me at this time, if I cut this article short. So, are you in for a wonderful illumination? Seize a memorable moment to cherish your modern car from now on: You may bid it farewell too soon for a momentous event later on.

Watch closely the piston rings against the Wankel apex seals. Much difference is in the manner of contact. So, Wankel surely fails to contain the high-pressure gas (and waste precious power miserably), therefore it cannot utilize a very cheap, bio-diesel fuel oil, or grandma’s used cooking oil. So, is there any alternative design that is simpler by far than Wankel yet powerful by far than jet engine, and economical by far than diesel engine? Without further ado, I have—and it is ALL FREE: no patent infringements to fear upon. Take a feature peek at the series of prime pictures above and the animation of its kinematics in the video.

See my design-contest entry sponsored by NASA Tech Briefs:
http://www.createthefuturecontest.com/pages/view/entriesdetail.html?entryID=766


video

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