Keywords: JSC RUMO, design documentation, patents, trademark, gas-engine-compressor unit, production, reciprocating engine

Reorganization of RUMO Works (earlier known as «Dvigatel Revolutsii») in 2019 resulted in the establishment of a new enterprise «JSC RUMO» as a Competency Center, expected to provide new engineering solutions and products for oil-and-gas, energy and shipbuilding industrial sectors. JSC RUMO acquired all the intellectual property rights from its antecedent, including design documentation, patents, trademarks RUMO Works and «Dvigatel Revolutsii» The new enterprise has already revived production of gas-engine-compressor units rated at 16 and 25 MW, and is preparing production of new line of multi-purpose diesel and gas engines rated at 800 and 1000 kW & 750 and 1000 rpm respectively.

Keywords: cylinder head, cooling, bubble boiling, intensification of convection heat exchange, mathematical model, verification.

Surface bubble boiling in diesel engine jacket passage enhances heat removal from engine jacket wall to coolant. Typical to most of known empiric models of boiling (e.g., that offered by J.Chen) is underestimation of design heat-transfer coefficient. The model offered herein is based on the mechanism of enhancement of convection heat exchange during boiling, making use of similarity between “vesicular” and physical roughness of engine jacket wall. The model is implemented as CFD-code and verified by the experiment carried out on original motorless heat-transfer test stand. The model in question is not demanding in terms of needed computing power, which enables its use in analyses of conjugate heat exchange in engine cylinder locks and heads.

Keywords: reciprocating engine, fuel injection, fuel jet evolvement combustion chamber geometry, optimization

The authors’ application developed in programming environment MS EXCEL enables analysis of fuel jet evolvement in engine combustion chamber with a view to optimize its geometry. Described are the methods of dynamic “animated” presentation of graphic information based on calculation results. The method in question makes use of liquid drop model. The authors provide the results of fuel jet evolvement calculations as applied to type Д-240 (ММЗ) diesel engine.

Keywords: Wankel engine, unburned hydrocarbons, carbon oxide, specific fuel consumption, hydrogen addition, petrol, lean air-fuel mixture.

One of the capital drawbacks of Wankel engines is imperfect combustion of air-fuel mixture, which, however, may be prevented with adding free hydrogen to the main fuel. The authors cite the results of their experiments with hydrogenated fuel. Adding free hydrogen to the main fuel results in higher fuel efficiency and lower percentage of unburned hydrocarbons and carbon oxides in exhaust gas when firing lean fuel mixture. Thus, adding small (up to 5%) doses of hydrogen to the main fuel secures stable Wankel engine operation at ?=1.3.

Keywords: diesel engine, control system, adaptive electronic control unit, results of experiments.

Comprehensive approach to engine operation management implies not only control of fuel supply, but also control over other engine systems. Adaptivity means flexible control system adjustment under varying engine operating conditions. Electronic control unit consists of two modules: universal processor module and a dedicated module designed for a particular engine type.Prototype electronic unit for new Kolomzavod engine type 26,5/31 has been manufactured. Its performance characteristics have been verified by tests on a single-cylinder laboratory engine.

Keywords: single-cylinder engine, harmonic analysis, combustible mixture composition regulator, phase of kinetic energy harmonic, governing procedure.

The author offered a method of control of combustible mixture composition, based on harmonic analysis of kinetic energy of moving parts of the engine and rigidly coupled load. Correlation between combustible mixture composition and phase of kinetic energy fundamental harmonic is evaluated. Also evaluated is correlation between engine temperature and kinetic energy harmonic parameters. A method is offered to correct kinetic energy fundamental harmonic phase during engine warm-up time, so as to minimize deviation of actual mixture composition from its set level.

Keywords: diesel engine, crank assembly, compression measurement, diagnostic methods, engine starting procedure, pumping losses.

An engine diagnostic method is offered, which enables evaluation of compression quality (total for all the cylinders) with no special measurement instrumentation. Tests of ultracapacitor-based engine starting system, with disabled fuel injection, has been carried out to determine dependence of pumping losses on number of opened indicator cocks and engine temperature. Energy content in the ultracapacitors being constant, opening indicator cocks results in lower cranking speed, which may be a sign of leakage through piston rings, inlet and outlet valves, or cylinder head/block interface. Accuracy of the method may be estimated as a minimum flow through of one half-opened indicator cock.

Keywords: reciprocating engine, boost, compression rate, lube oil, motor stand tests, lube oil ignition, gaseous fuel, methane number.

Tightening emissions controls, efficiency and fuel flexibility are driving engine technology evolution to satisfy increasingly demanding market needs and regulations. To address these requirements, well established concepts like miller timing, increased compression ratios and dual or multi-fuel engine designs continue to expand to medium speed engines applications. For engine oils used in these applications, all these approaches have resulted in exposure to higher oil stresses that accelerate oil degradation which is reflected in reduced oil service life as condemnation limits are reached faster particularly in terms of base number depletion and lubricant viscosity increase. Facing these challenges, it is expected that commercial trunk piston engine oil (TPEO) technologies are undergoing the next development cycle, as more demanding applications penetrate the market and most of current lubricant products have been available for over a decade. The paper presented by Shell Global Solution highlights the increasing relevance of using engine testing tools on top of traditional approaches to develop TPEOs and challenge some bench testing and performance relationships. Improved test protocols and engine control systems for Shell’s Caterpillar-AVL test engine (1-cylinder AVL diesel engine LEF model with a Caterpillar 1Y540 top construction) will be presented to show how this tool can be utilized to generate reliable and repeatable test data for discovery and benchmarking purposes, highlighting discrimination for high performance candidate formulations to prove their robustness and readiness for further testing in full size engines such as Shell’s Wartsila 4L20D as well as field engines running under conditions capable to discriminate the performance of a lubricant.

The paper presented by GDEC Inc. and TOTAL describes the results of the fundamental research with a Rapid Compression Machine (RCM) was conducted. Using the RCM, the ignition delay of the lubricating oils with different formulation was measured with various ambient conditions to investigate the effect of the characteristics of the oil. After this fundamental test, the single cylinder test under the similar conditions as commercial engines is scheduled as the next step of the research to confirm the validity of the results of RCM test. This phenomenon could be the impediment to the improvement of the engine efficiency and the increase of mean effective pressure in the future development of engines because it becomes severer by increasing compression ratio and mean effective pressure. In consideration of the fact that this phenomenon is much more apparent on the industrial gas engines in Japanese market where the city gas with very low Methane Number is used, it is expected that this issue will be more common when LNG with the wide range of Methane Number will be used as the fuel of gas engines all over the world from now, especially in the marine application where Methane Number changes also depending on the tank level. Through the experiences on many production engines and the test engines, it has been found that this kind of preignition is the complicated phenomenon affected by many contributing factors such as the compression temperature, lambda of mixture, Methane Number of fuel gas, mean effective pressure and so on. But the contribution of each factor has not been clarified quantitatively yet.
The CIMAC papers are translated into Russian by G.Melnik, PhD.