Evaluation of nonmeasurable parameters of electronic systems

Translated from Izmeritel'naya Tekhnika, No. 11, pp. 12–14, November, 1990.     

Generalizing operation experience of CA-1P granulated ammonia synthesis catalyst for a column daily capacity of 200, 600, and 1360 tons of NH3

The 15-year operation experience of the CA-1P granulated ammonia synthesis catalyst is generalized for a column daily capacity of 200, 600, and 1360 tons of ammonia. When prepared by continuous iron melting, with the simultaneous additions of promoters, the CA-1P granulated ammonia synthesis catalyst is more advantageous than ground catalysts (1.5- to 1.7-fold faster reduction at the lower temperature of 360°C and higher activity), and its production prospective was shown. On the basis of the developed technology, the NIAP-08-01 catalyst was prepared to pass through industrial tests in ammonia synthesis columns of various design (tube and multiple-shell) and daily capacity (200, 600, and 1360 tons). Various loading schemes of the CA-1P catalyst were tested, using fine (3–5 and 5–7 mm) fractions up to 40%. No increasing resistance in catalyst layer was observed. Use of the CA-1P catalyst increased column efficiency by 5–10%. Generalized operation experience of the CA-1P (NIAP-08-01) catalyst enabled to recommend it for a column daily capacity of 1360 tons in columns with radial gas flow.     

Correlations study in shock wave/turbulent boundary layer interaction

The shock waves/turbulent boundary layer interaction is a problem of critical importance that is frequently encountered in designing flying vehicles. Presently, the most topical issue is the investigation of nonstationary phenomena (in particular, low-frequency effects) involved in this interaction. We have experimentally studied separated flows in the zone of interaction between an obliquely incident shock wave and a turbulent boundary layer at a Mach number of M = 2. Correlation data in the separation zone and the upstream flow were obtained. It is established that low-frequency oscillations in the reflected shock are related to the pulsation in the inflow boundary layer.     

Nonstationary flow field generated by dielectric barrier discharge

The search for new methods of the flow control is of great importance because the capability of traditional control devices is one of the limits of the aircraft efficiency. A promising method of flow control involves application of electrogasdynamic devices based on the direct transformation of the electric energy to the force acting on the flow. An activator employing the principles of dielectric barrier discharge (DBD) was studied. Nonstationary characteristic of the activator have been studied by measuring the electrodynamic parameters of DBD and the induced velocity fields (particle image velocimetry). Instantaneous and integral parameters of the gas acceleration are determined and the activator efficiency is evaluated.