MEASURING ARRANGEMENT FOR DETERMINING A PARAMETER OF A FLUID MEDIUM FLOWING THROUGH A FLUID FLOW CHANNEL AND FLUID FLOW CHANNEL HAVING SUCH A MEASURING ARRANGEMENT

Abstract

A measuring arrangement for determining at least one parameter of a fluid medium flowing through a fluid flow duct. The measuring arrangement includes a probe device designed to be arranged in the flowing medium as a hollow body having an incident flow side closing the cavity of the hollow body, an open discharge flow side, an outer contour, which generates a flow separation on the discharge flow side, for generating a backflow, and a partition wall dividing the cavity into a fluid inflow chamber and a fluid outflow chamber, wherein the fluid inflow chamber includes an inlet opening and the fluid outflow chamber includes an outlet opening.

Claims

1-9. (canceled)

10. A measuring arrangement for determining at least one parameter of a fluid medium flowing through a fluid flow duct, comprising: a probe device designed to be arranged in the flowing medium as a hollow body including an incident flow side closing the cavity of the hollow body, an open discharge flow side, an outer contour, which generates a flow separation on the discharge flow side for generating a backflow, and a partition wall dividing the cavity into a fluid inflow chamber and a fluid outflow chamber, wherein the fluid inflow chamber comprises an inlet opening and the fluid outflow chamber comprises an outlet opening, and a sensor arrangement which is fluidically connected via a fluid supply duct to the inlet opening and via a fluid exhaust duct to the outlet opening to create a measuring duct through which the backflow flows.

11. The measuring arrangement as claimed in claim 10, in which the hollow body is formed having a high flow resistance to the fluid medium.

12. The measuring arrangement as claimed in claim 10, in which the hollow body is formed having a high pressure resistance to the fluid medium.

13. The measuring arrangement as claimed in claim 10, wherein the discharge flow side of the hollow body forms a discharge flow plane oriented perpendicularly to the flow direction of the flowing fluid medium, and the discharge flow plane forms, with a circumferential surface of the hollow body extending in the flow direction, an edge resulting in the separation of the flowing medium.

14. The measuring arrangement as claimed in claim 10, in which the hollow body is formed as a blunt hollow body.

15. The measuring arrangement as claimed in claim 10, in which the hollow body is designed as pot-shaped having a cylindrical circumferential wall and a pot base forming the incident flow side.

16. The measuring arrangement as claimed in claim 10, in which the sensor arrangement is formed having a sensor measuring the air quality of air as the fluid medium.

17. The measuring arrangement as claimed in claim 16, in which the sensor is formed as a fine dust sensor.

18. A fluid flow duct, in which the fluid flow duct is formed as a fresh air duct of a vehicle climate control system comprising: a measuring arrangement for determining at least one parameter of a fluid medium flowing through a fluid flow duct a probe device designed to be arranged in the flowing medium as a hollow body including an incident flow side closing the cavity of the hollow body, an open discharge flow side, an outer contour, which generates a flow separation on the discharge flow side for generating a backflow, and a partition wall dividing the cavity into a fluid inflow chamber and a fluid outflow chamber, wherein the fluid inflow chamber comprises an inlet opening and the fluid outflow chamber comprises an outlet opening, and a sensor arrangement which is fluidically connected via a fluid supply duct to the inlet opening and via a fluid exhaust duct to the outlet opening to create a measuring duct through which the backflow flows.

19. The measuring arrangement as claimed in claim 11, in which the hollow body is formed as a blunt hollow body.

20. The measuring arrangement as claimed in claim 12, in which the hollow body is formed as a blunt hollow body.

21. The measuring arrangement as claimed in claim 13, in which the hollow body is formed as a blunt hollow body.

22. The measuring arrangement as claimed in claim 11, in which the hollow body is designed as pot-shaped having a cylindrical circumferential wall and a pot base forming the incident flow side.

23. The measuring arrangement as claimed in claim 12, in which the hollow body is designed as pot-shaped having a cylindrical circumferential wall and a pot base forming the incident flow side.

24. The measuring arrangement as claimed in claim 13, in which the hollow body is designed as pot-shaped having a cylindrical circumferential wall and a pot base forming the incident flow side.

25. The measuring arrangement as claimed in claim 11, in which the sensor arrangement is formed having a sensor measuring the air quality of air as the fluid medium.

26. The measuring arrangement as claimed in claim 12, in which the sensor arrangement is formed having a sensor measuring the air quality of air as the fluid medium.

27. The measuring arrangement as claimed in claim 13, in which the sensor arrangement is formed having a sensor measuring the air quality of air as the fluid medium.

28. The measuring arrangement as claimed in claim 14, in which the sensor arrangement is formed having a sensor measuring the air quality of air as the fluid medium.

29. The measuring arrangement as claimed in claim 15, in which the sensor arrangement is formed having a sensor measuring the air quality of air as the fluid medium.

Description

[0026] Further advantages, features, and details of the invention result from the claims, the following description of preferred embodiments, and on the basis of the drawings. In the figures:

[0027] FIG. 1 shows a schematic illustration of a measuring arrangement having a probe device and a sensor arrangement according to the invention in a fresh air duct of a vehicle climate control system,

[0028] FIG. 2 shows a schematic illustration of the probe device according to FIG. 1 with a flow profile of a fluid medium, and

[0029] FIG. 3 shows a sectional illustration of the probe device according to section A-A in FIG. 2.

[0030] FIG. 1 shows a fluid flow duct 10 of a vehicle climate control system formed as a fresh air duct, which is equipped with a measuring arrangement 1, consisting of a probe device 2 and a sensor arrangement 3. The probe device 2 is subjected here to a fluid medium L1 flowing into the fluid flow duct 10 in direction S1, which represents an air flow L10, namely a fresh air flow, which is guided in direction S2 via adjustable fresh air control flaps 12 into an air conditioner of the vehicle climate control system.

[0031] The probe device 2 is designed as a passive component such that a constant sensor volume flow branches off from the air flow L10 independently of the fluid-dynamic states prevailing inside the fluid flow duct 10 and is supplied via a measuring duct 4 to a sensor arrangement 3 having a sensor 3.1 as a fine dust sensor and is recirculated into the fluid flow duct 10.

[0032] This probe device 2 is formed as a hollow body 2.1 having an incident flow side 2.10 and a discharge flow side 2.11, wherein this hollow body 2.1 is arranged in the fluid flow duct 10 in such a way that the incident flow side 2.10 is oriented upstream in relation to the flow direction S1 and the discharge flow side 2.11 is oriented downstream in relation to the flow direction S1.

[0033] The hollow body 2.1 of the probe device 2 is embodied as pot-shaped having a pot base 2.22 and a cylindrical circumferential wall 2.21, so that the pot base 2.22 forms the incident flow side 2.10 and thus closes the cavity 2.3 of the hollow body 2.1, while the opposite side is open as the discharge flow side 2.11.

[0034] The air flow L10 is incident on the incident flow side 2.10 corresponding to FIGS. 2 and 3 and, due to the outer contour 2.2 of the hollow body 2.1 in the resulting trailing area, leads to a flow separation on the discharge flow side 2.11 while forming a separation area G.

[0035] The hollow body 2.1 therefore has an outer contour 2.2 which results in this flow separation. For this purpose, the hollow body 2.1 has a high flow resistance and/or a high pressure resistance and is embodied as a blunt hollow body 2.1.

[0036] The flow separation is achieved by an unevenly extending outer contour 2.2 of the hollow body 2.1 in the region of the discharge flow side 2.11. A geometry-induced flow separation is thus provided. The discharge flow side 2.11 of the hollow body 2.1 is perpendicular to the flow direction S1 of the supply air flow L10 and forms a discharge flow plane E, which, with a circumferential surface 2.20 of the cylindrical circumferential wall 2.21, forms an edge K which causes a separation of the supply air flow L10.

[0037] Flow eddies or turbulence arise in the separation area G with the result that a chronologically fixed separation flow line does not exist between the separation area G and the ambient flow of the probe device 2, whereby a sufficient exchange takes place between the separation area G and the incident flow and thus a backflow L2 arises into the open discharge flow side 2.11 of the hollow body 2.1, i.e., thus into its cavity 2.3. Pollutants of the exhaust air flow L10 can thus also be measured in the separation area G.

[0038] According to FIG. 3, the cavity 2.3 of the hollow body 2.1 is divided by means of a partition wall 2.4 into a fluid inflow chamber 2.31 and a fluid outflow chamber 2.32. The fluid inflow chamber 2.31 comprises an inlet opening 2.5, while the fluid outflow chamber comprises an outlet opening 2.6, wherein both the inlet opening 2.5 and also the outlet opening 2.6 are arranged in the circumferential wall 2.21 of the hollow body 2.1. The inlet opening 2.5 is connected via a fluid supply duct 4.1 as part of the measuring duct 4 to the sensor 3.1, via which the backflow L2, as air flow L20 flowing into the fluid inflow chamber 2.31, is recirculated to the sensor 3.1 and subsequently via a fluid exhaust duct 4.2, which connects the sensor 3.1 to the outlet opening 2.6, back into the fluid outflow chamber 2.32 and subsequently is guided back into the fluid flow duct 10 as ambient air flow L21 flowing in circulation out of the fluid outflow chamber 2.32 (cf. FIGS. 2 and 3).

[0039] The partition wall 2.4 avoids interactions between the air intake via the inlet opening 2.5 and the subsequent injection after the measurement via the outlet opening 2.6 back into the fluid flow duct 10.

[0040] The inlet and outlet opening 2.5 and 2.6 are arranged spatially close to one another so as not to strain a fan of the sensor 3.1 due to a high pressure difference and to avoid a negative effect of the sensor volume flow resulting therefrom.

[0041] Using such a measuring arrangement 1 in a fluid flow duct 10 of a vehicle climate control system, the fine dust concentration of the air flow L10 supplied as a fresh air flow is ascertained, wherein the air flow L20 of the backflow L2 taken in via the inlet opening 2.5 is supplied as a sensor volume flow to the sensor 3.1 as the air quality sensor independently of the operating conditions inside the fluid flow duct 10 and thus as a constant volume flow.

LIST OF REFERENCE SIGNS

[0042] 1 measuring arrangement [0043] 2 probe device [0044] 2.1 hollow body of the probe device 2 [0045] 2.10 incident flow side of the hollow body 2.1 [0046] 2.11 discharge flow side of the hollow body 2.1 [0047] 2.2 outer contour of the hollow body 2.1 [0048] 2.20 circumferential surface of the hollow body 2.1 [0049] 2.21 circumferential wall of the hollow body 2.1 [0050] 2.22 pot base part of the hollow body 2.1 [0051] 2.3 cavity of the hollow body 2.1 [0052] 2.31 fluid inflow chamber of the hollow body 2.1 [0053] 2.32 fluid outflow chamber of the hollow body 2.1 [0054] 2.4 partition wall of the hollow body 2.1 [0055] 2.5 inlet opening of the fluid inflow chamber 2.31 [0056] 2.6 outlet opening of the fluid outflow chamber 2.32 [0057] 3 sensor arrangement [0058] 3.1 sensor [0059] 4 measuring duct [0060] 4.1 fluid supply duct [0061] 4.2 fluid exhaust duct [0062] 10 fluid flow duct [0063] 12 fresh air control flaps [0064] E discharge flow plane [0065] G separation area [0066] L1 fluid medium [0067] L10 air flow [0068] L2 backflow into the separation area G [0069] L20 air flow flowing into the fluid inflow chamber 2.31 [0070] L21 air flow flowing out of the fluid outflow chamber 2.32 [0071] K edge of the hollow body 2.1