Keywords: reciprocating engine, mathematical model, software, combustion, system dynamics.

The authors developed original mathematical model and software for reciprocating engine simulation. The model is based on energy & mass balance method, and bond graph theory. Basically, it is the library of elements, which describe processes in engine systems and mechanisms. The model and software in question overperform known state-of-art analogs in terms of computational speed, reliability and precision, which is verified by comparative tests. They enable conjugate simulation of steady-state and transient multidomain processes in various systems and mechanisms of a reciprocating engine.

Keywords: aircraft engine, nonstationary air current, aircraft component, mechanical degradation, hardening methods.

The authors investigated changes in mechanical properties of aircraft components exposed to nonstationary air currents. The results of the investigation enabled them to optimize duration and intensity of mechanical treatment of said components. Considered methods of aircraft component hardening are shown to be applicable not only in manufacturing technologies, but also for maintenance and repair. Long-term exposure to nonstationary air currents is demonstrated to result in mechanical degradation of aircraft components.

Keywords: alternative energy sources, generator gas, mixed fuel, indicating diagram, effective performance indices, petrol fuel saving.

The article discusses the results of stand tests of spark ignition engine type 1CH6,8/5,4 operating alternatively on gasoline, generator gas and their mixture. Dependences of performance indices on engine speed and load have been determined. Based on indicating diagrams heat release curves have been traced. As it happened, up to 70% gasoline may be substituted for generator gas with no appreciable decrease in effective performance indices, emission and thermal stress characteristics being definitely improved.

Keywords: diesel power plant, active waste heat boiler, solid fuel, high-temperature fluidized bed, exhaust gas heat recovery, improvement of boiler efficiency, emission reduction.

Presented is a review of known solutions for power plant with active waste heat boilers featuring high-temperature fluidized bed. The authors developed mathematical model and calculated parameters of power plant featuring exhaust gas injection into the boiler furnace. Possibility of improvement in solid fuel boiler efficiency and emission reduction without compromising plant heat power is shown.

Keywords: solid fuel boiler, high-temperature fluidized bed, combustion controls, flue gas recirculation, disturbances, transient performance.

Application prospects and possible ways of efficiency improvement for low-powered boilers featuring high-temperature fluidized bed (HTFB) and flue gas recirculation are considered. Transient characteristics of HTFB boilers in response to various disturbances are plotted by means of numerical modelling. It is shown that solid fuel combustion characteristics in HTFB boilers featuring flue gas recirculation are definitely better than those in no-recirculation boilers. In particular, HTFB boilers demonstrate shorter response time and transient period, with optimum excess air ratio.

Keywords: reciprocating engine, no-dismantle repair, friction geomodifiers, antifriction coatings, coating composition and properties, mechanism of coating formation and building-up.

Considered are a number of antifriction compositions for no-dismantle repair of worn-out contact surfaces of various machines, including reciprocating engines, based on fine-grained powder from mineral serpentines or friction geomodifiers (FGD). Structure and properties of coatings on rebuilt parts were studied, whereupon a hypothesis of FGD-based coatings formation on engine parts exposed to lube oil was offered. Said hypothesis accounts for coating build-up even after FGD is removed from lube oil.

Keywords: diesel engine, NOx emissions, polymer membrane, oxygen reduction, water mixed fuel, nano-level disperse water phase, complex components, 3D printing, metal powder, laser additive manufacturing, design methods.

The review covers new engine building technologies that contribute into emission reduction and resource saving when manufacturing complex components on 3D printer.
Asahi Kasei Chemicals Corporation (Japan) presented the results of testing the NOx reduction system that decreases the oxygen concentration in the intake or scavenging air using a special polymer membrane (ORM — oxygen reduction membrane). In order to secure compliance with IMO Tier III specifications for NOx emissions, ORM system was added with a newly developed water mixed fuel (WMF) system, in which the fuel is mixed with water just prior to the fuel injection device, generating steady combustion without additives by reducing the droplet size to the nano-level.
Implementation of 3D printing (metal additive) technology enabled us to break boundaries of conventional design and manufacturing, particularly when it comes to parts of sophisticated geometry. General Electric (GE) provides the review of today status of metal additive manufacturing in its branches, and identifies criteria for components targeted for serial production with said method. According to GE, crucial for the success of this technology is to re-imagine the design process and close out boundaries that has been forced into the heads of the engineers.
The CIMAC papers are translated into Russian by G.Melnik, PhD.