Multi-Channel Pressure Fields Measuring Systems

MMD-32 and MMD-48 Multi-point Pressure Modules

Multi-channel pressure modules are the main mean of investigating the pressure distribution on the model surface which use the strain gage principle of converting pressure into electric signal.

A number of multi-point pressure modules is developed in TsAGI according to the number of channels (MMD-24; MMD-32; MMD-48; MMD-64; MMD-128) and a new generation measuring system with multi-point pressure modules is created.

Comparative Performances of Multi-Channel Pressure Modules

Characteristics/MMD	MMD-24	MMD-32	EMMD-48	MDK-64
Measurement range, kPa	100	100	100	100
Measuring error, %	0.15…0.2	≤0.15	0.15	0.15
Volume per channel (without fittings), sm3/ch	2.2	0.18	2.3	0.56
Outer dimensions (without fittings), mm	70×32×30	59×12×9	102×75×20	42×27×22
Output signal	analog	analog	digital RS485	analog

Technical Characteristics

Number of channels:
MMD-32 (16 modules)	512
MDK-64 (8 modules)	512
EMMD-48 (10 modules)	480
Rated pressure, kPa	10; 40; 100
Data acquisition rate, channel/s	5000
Baseline reduced error of pressure measuring, %	±0.15

Application

Pressure distribution research in wind tunnels of TsAGI and other organizations of the branch.
Testing the An-78 aircraft model (USC "Antonov") in T-106 WT (TsAGI).